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In a room of $23$ people what is the probability that $2$ of. them has a birthday in common?

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therefore the probability is = 23C2 *(1/365)*(364*363*362*...*344)/(365)21

Or

therefore the probability is = 23C2 *(1/365)^2*(364*363*362*...*344)/(365)21

 

Which one is correct@ srestha

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