1 What Is The Probability Of Exactly 2 People In A Group Of 10 To Have The Same

1)What is the probability of exactly 2 people in a group of 10 to have the same birthday?

Please answer in the form of a probability to the thousandths place (i.e. use decimal places).

2) 4 fair coins are tossed in the air at once. What is the probability of obtaining 3 heads and 1 tails?

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