Re: same birthday
If I'm understanding your question correctly...
The odds of you and your brother having the same birthday are 364:1.
The odds of you and your brother being born on one particular date are 133224:1.
The odds of you all having the same birthday are 133224:1.
The odds of you all being born on one particular date are 48627124:1.
Remember there's a difference between odds and probability.
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