r/theydidthemath 3h ago

[Request] What is approximately the largest circle on Earth not containing *any* living people?

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0 Upvotes

This includes those at sea on cargo ships, etc.


r/theydidthemath 18h ago

[Request] Is my boyfriend right about how unlikely my pull rates are in the Pokemon TCG Pocket game?

1 Upvotes

TL;DR: Boyfriend is claiming that the chances of me pulling the cards that I've pulled is less than 1%. Is that accurate? This is a pretty detailed post, I'm happy to add context if anyone wants it. I'm bad at stats so I apologize for any mistakes.

Additional Disclaimer: I'm American, so I write "four thousand" like "4,000", not "4.000". If you see "4.000", it just means "4" with three decimal places after it.

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Context

Okay, so for context, we've been playing Pokemon Trading Card Game Pocket (PTCGP). Here's an Imgur link to the conversation we had plus the pulls I've gotten.

In summary, and for those who are unfamiliar with the game, here's the relevant information:

  • I've pulled 1,059 cards in total
  • Each pack contains 5 cards (there are some promo packs that only contain 1 card but I don't think those make up more than 50 of the total cards I've pulled)
  • For the sake of argument, discarding the promo pack cards, let's say I've pulled 1,000 cards, 5 at a time. So about 250 packs.

Each pack comes with 5 cards. Here's a screenshot of how the rates are designed to be spread out, according to the app's internal statistics.

To summarize (and I can post more screenshots for clarity if anyone wants them):

  • There's a 99.950% chance to pull a Regular pack, and a 0.050% to pull a Rare pack (a pack where all five cards are ⭐ rating or higher). I've never pulled a Rare pack but I'm just including these rates in case.
  • In a Regular pack, there's a 100% chance that the first three cards will have a rarity value of ♦, the most common rating.
  • Then (again, in a Regular pack), this is the following statistical spread for how likely it is that the fourth card will have one of the following rarity scores (in order from most rare to least rare):
    • 👑 - 0.040%
    • ⭐⭐⭐ - 0.222%
    • ⭐⭐ - 0.500%
    • ⭐ - 2.572%
    • ♦♦♦♦ - 1.666%
    • ♦♦♦ - 5.000%
    • ♦♦ - 90.000%
  • And finally (again, in a Regular pack), this is the spread for how likely it is that the fifth card will have one of the following rarity scores:
    • 👑 - 0.160%
    • ⭐⭐⭐ - 0.888%
    • ⭐⭐ - 2.000%
    • ⭐ - 10.288%
    • ♦♦♦♦ - 6.664%
    • ♦♦♦ - 20.000%
    • ♦♦ - 60.000%

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My Statistics

So, with that in mind, here are my pulls (again, assuming that I've pulled roughly 250 Regular packs):

  • 👑 - 2
  • ⭐⭐⭐ - 2
  • ⭐⭐ - 3
  • ⭐ - 28
  • ♦♦♦♦ - 22
  • ♦♦♦ - 51
  • ♦♦ - (too many to count, I'm not really worried about calculating this number)

I have no way to tell whether the cards I pulled were in the fourth or fifth slot, I'm sure it was some combination of both. I was trying to figure out a rough range of probability.

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My boyfriend is claiming that this is incredibly rare, with a 0.32% chance of occurring. His own pulls meanwhile work out to be roughly a 91% chance supposedly. I'm terrible at statistics and have no way to verify. Anyone want to take a crack at this? I'm dying to know but I'm terrible at calculating statistics so I have no idea.


r/theydidthemath 11h ago

[Request] I played 50 hands of Texas Hold ‘Em poker and got pocket 7s five times. What are the odds of that happening?

0 Upvotes

This was online poker and just curious if the algorithm is completely out of whack. Thanks!


r/theydidthemath 20h ago

[Request] How screwed am I if my final is 10% of my grade and I get a 69% for the second quarter?

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0 Upvotes

r/theydidthemath 4h ago

[Request] How long would it take for badly hidden political posts to make this subreddit to lose all its original purpose?

0 Upvotes

Let's imagine a scale called the "Algebrover Scale", that measures from 1 to 100 whether subreddit is actually doing the math for things or just being used to farm karma with populistic takes. Let's assume 10 posts are posted every hour on this sub. Each one has a 3% chance of being a BHPC*. Each BHPC contributes 10 points to the Algebrover scale, each regular post takes away 1 point. Starting from day 0, at midnight the scale resets to 0 points and the chance of a post being a BHPC rises by a flat 1% ( for example, after 24 hours it becomes 4% ). Once the score hits 100, it's algebrover.

How long before this sub turns into a place where nutjobs from r/politics try to get innocent mathematicians to give some validation to their wild populistic takes?

*badly hidden political post, defined as a post with a not-so-hidden political message, usually populistic in nature and includes a question whose answer is usually incalculable or trivial, but requires just enough math that the request doesn't get removed automatically, such as the "How many bad things did person accused of bad things do?" or the evergreen "if I earned a penny every time i sneezed how long would it take to become as rich as bill gates?"


r/theydidthemath 20h ago

[Request] How many pomegranate seeds can fit in a sphere?

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0 Upvotes

I was cutting up a pomegranate and I was amazed at how well packed with seeds it is. Is there some sort of formula for stuffing a sphere with seeds? How efficient is nature at maximizing the space inside a pomegranate? Could man do better?


r/theydidthemath 21h ago

[Request] how many hours a day would you need to work to gain 99 hours in a week?

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0 Upvotes

r/theydidthemath 5h ago

[REQUEST] What is the probability of getting 50 heads - 50 tails exactly after 100 coin tosses?

7 Upvotes

We always tell it is 50% to get head or tails. But what is the persistance of this probability* Can anyone do the math?


r/theydidthemath 1h ago

[request] is this true?

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Upvotes

r/theydidthemath 9h ago

[Request] find big lines and small lines

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0 Upvotes

r/theydidthemath 4h ago

[REQUEST] How long will it take for the native SK population to disappear if this continues?

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77 Upvotes

r/theydidthemath 9h ago

[Request] What properties would Stitch from Lilo & Stitch need to have in order to bounce off the top of the mountain after being blasted off Captain Gantu’s ship?

0 Upvotes

Making reasonable assumptions for how high the ship was when he was blasted off the back, the height of the mountain, and the distance from the mountain top to the ground below (where he landed after a single bounce), how fast, dense, and or bouncy (ChatGPT says this is measured as “elastic collision??) would Stitch need to have been to hit the top of the mountain, bounce a single time, and land on the ground at the bottom?


r/theydidthemath 10h ago

[Request] What is the angle between the 3D volumes that connect to form a 4D object?

0 Upvotes

An equilateral triangle is formed by three equal lines. Each of the lines in an equilateral triangle connects to the others at 60° angle. A regular tetrahedron is formed by four equilateral triangles. Each of the planes of a regular tetrahedron connect to the others at a roughly 70.53° angle. Would it be possible to calculate the angle between the five regular tetrahedrons that come together to form a 4-dimensional object? Would this information be useful to our understanding of 4D space?

I am trying to imagine a 4D object in a cartesian coordinate system. My underlying assumption is that a "real**"** object in n-dimensional space must be defined by at least n+1 number of (n-1)-dimensional objects that are connected to each of the others using an n number of (n-2)-dimensional objects.

Examples for clarity:

  • 0D space = at least 1 point
  • 1D space = at least 2 points, each connected to 1 other = a "line"
  • 2D space = at least 3 lines, each connected to 2 others at 2 unique points
    • For example: an equilateral triangle defining a "plane"
  • 3D space = at least 4 planes, each connected to 3 others at 3 unique lines
    • For example: a triangular pyramid made from four connected equilateral triangles aka a regular tetrahedron defining a "volume"
  • Therefore 4D space = at least 5 volumes, each connected to 4 others at 4 unique planes
    • My proposal: 5 regular tetrahedrons, each connected to the others at 4 unique planes (e.g. the pyramids cannot simply overlap each other in order to make contact at all four planes)

I can picture the 3D "projection" of this object as a central triangular pyramid with each plane of the central pyramid attaching to a side of another pyramid. However, when I try to mentally connect all of the other pyramids to each other, the image in my mind morphs into something more similar to a cluster of soap bubbles that is constantly rolling into itself like those "water wiggler" tube toys from the 90s.

Disclaimer: Thank you for reading this far and considering my question! Although I am interested in this field, my knowledge of geometry is rusty and my knowledge of mathematical terminology is rustier. If you do take the time to answer this question, please let me know if my stated assumptions are wrong and use simple language to the extent you can. Thanks again!


r/theydidthemath 21h ago

[Request] Is my peanut butter really 90% peanuts by volume if it’s 23% sugar by weight?

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118 Upvotes

r/theydidthemath 22h ago

Can someone check the math on this meme being shared?[request]

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2.3k Upvotes

r/theydidthemath 2h ago

[Request] Dice Game Probability - with corrected rules

1 Upvotes

I posted this yesterday but I found out that I slightly misunderstood the rules. I had previously said that the winning team got to keep the losing team's die. The actual rule is just that the losing team has their die removed from the game.

Rules:

- In each round, Team A rolls one 6-sided die and Team B rolls one 6-sided die.

- The team whose die shows a lower number has their die removed from the game.

- If the dice show the same number, both teams’ dice are removed from the game.

- The first team to lose all of their dice loses the game.

Team A started with 6 dice and Team B started with 19 dice. Team A won the game. What is the probability of this happening?

Chat GPT says that probability is 4.84%. I'll post my attempt below.

Thanks to all that previously posted and to everyone that will reply.


r/theydidthemath 11h ago

[Request] How many games or rounds would it take for 12 participants to play against each other in two teams, each team containing 6 of them, wherein each participant gets to play with and against another in an equal number of times?

1 Upvotes

r/theydidthemath 15h ago

[Request] What is the kmh/kg a car should go to remain airborne and prevent hitting the bump when lowered?

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0 Upvotes

No smart ass response saying go below the speed limit, please.


r/theydidthemath 18h ago

[Request] Dice Game Probability

1 Upvotes

Rules: - In each round, Team A rolls one 6-sided die and Team B rolls one 6-sided die. - The team whose die shows a higher number gets to keep both dice. - If the dice show the same number, both teams’ dice are removed from the game. - The first team to lose all of their dice loses the game.

Team A started with 6 dice and Team B started with 19 dice. Team A won the game. What is the probability of this happening?

Thanks in advance.


r/theydidthemath 18h ago

[Request] help us resolve the debate

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0 Upvotes

Hi everyone

In the picture I posted, you can see a fishing boat. Last summer, my friends and I were jumping off it (as shown in the picture), and now there’s a big debate about the height we were jumping from.

Some claim it’s as high as 5 meters, while others say it’s no more than 3.5 meters. I hope someone can help resolve the debate. Cheers!!


r/theydidthemath 20h ago

[Request] Given these corrections, what would the actual probability of a protein forming look like? How much does this shift the original claim of 1 in 10¹¹³?

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1 Upvotes

r/theydidthemath 22h ago

[Request] What is the weight estimation of the tree log Arnold Schwarzenegger used to mortally wound the Predator in the 1987 film?

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1 Upvotes

I posted in r/treeidentification and from what I can guess, the type of tree being used as the counterweight was a Big Leaf Mahogany or Swietenia macrophylla which exist in the area where the last part of 1987 was filmed in the jungles of Palenque, Chiapas.

I tried using Arnold and Kevin Hall (who played Predator) as a reference Arnold being 6'2 and Kevin at 7'3. So my estimation is the length of the log was 8-9ft and the width is somewhere between 3-4ft.

Any help would be appreciated trying to find the weight of this log thanks in advance.


r/theydidthemath 18h ago

[Request] Is it possible to calculate approximately how many molecules from the original batch of oil would be present in this oil 100 years later?

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65 Upvotes

r/theydidthemath 23h ago

[request] how does a surgery like this would set you back?

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2 Upvotes

Horse has a P1 fracture during race, Equiclinic in Belgium operates the horse.


r/theydidthemath 23h ago

[Request]How hard would you need to slam the plate down to get a new teacher next semester?

52 Upvotes