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you are in a classroom that has 20 students, each of them having a birthday that was randomly chosen from 365 days. 1) what's the

you are in a classroom that has 20 students, each of them having a birthday that was randomly chosen from 365 days.

1) what's the probability of all of them having the same birthday on June 1st?

2)find the probability of at exact 10 students having the same birthday on June 1st?

3)what's the probability of all of them having the same birthday date?

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