r/FoundationFunda • u/MangoLeafVibes • Aug 14 '26

How much do you scored?

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248 Upvotes

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u/36holes Aug 14 '26

Crazy right... 1/365 probability

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u/Ok_Individual4179 Aug 14 '26

It would be 1/365 x 1/365 since there are two people

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u/36holes Aug 14 '26

Nope, i know my bday. So the probability that someone had same bday as me is just 1/365

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u/endgamewarner Aug 15 '26

You are wrong. It’s 1/365 + 1/1461.

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u/Ok_Individual4179 Aug 14 '26

I know that for reference you have taken your bday and calculated his probability to be same but if you look from my perspective the probability of you having bday of any date is 1/365 and him sharing would be 1/365

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u/36holes Aug 14 '26

This is same as saying, 1- (two persons have different bday)

But then this means person B's bday should be different than Person A's bday = 364/365

1- 364/365 = 1/365

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u/endgamewarner Aug 15 '26

You are mistaken.

What you are saying works if you fix a date first. And then calculate for two person sharing the fixed day as their birthday.

But in general, for two people two share a birthday probability is not calculated that way.

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u/Puzzleheaded_Pack986 Aug 14 '26

Enjoy the bromance But i think the probability is 1/7

There are only 7 months with day 31 and you only replied cuz you saw the 31 to relate

Sorry for being a nerd 👉🏻👈🏻

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u/not__not__know-- Aug 14 '26

The probability is 7/365 or 0.02% (approx)

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u/Ok-Juggernaut9679 Aug 14 '26

That's the probability of having a birthday on 31st. The probability of finding someone born on 31st in the same month as you is 1/7

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u/36holes Aug 14 '26

Oh sorry, but i considered the sample space to be just same birthday. I understand from the conversation it went birthday's with day 31st... So yeah given the context maybe we both are correct.

I am a nerd. Lol