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1 vote
1 answer
106 views

At least how many residents of the country have the same birthday?

I am trying to solve a pigeonhole question in discrete mathematics. Let's suppose that a country has 11.000.000 people. At least how many residents of the country have the same birthday? Take into ...
ek.Sek's user avatar
  • 497
-2 votes
1 answer
68 views

Probability of birthday [closed]

In this years IMO a decision has been taken that each team will be consist of 10 members. What is the probability that at least two people will have a birthday on the same day of the week?
Pritom Biswas Tom's user avatar
2 votes
0 answers
218 views

Generalized Birthday Problem? Combinatorics

I am having a difficult time understanding how to think about and analyze the following problem: (I have done research, but I am not sure how to phrase my enquiries and my research seems to be almost ...
Drew's user avatar
  • 59
0 votes
2 answers
3k views

Birthday Paradox: 4 people What is the probability that two (or more) of them have the same birthday?

Four people around a room. What is the probability that two (or more) of them have the same birthday? However, I am not sure if my working out assume finds out about the 2 or more part. I am using ...
Mary.Math's user avatar