Asked by Meghan

What is the probability that at least 2 people in a random group of 4 people have a birthday on the same day of the week? Answer:










Answered by Mgraph
The opposite event is that 4 people have
birthdays on different days of the week.
Its probability=(7*6*5*4)/(7^4)=120/343
Therefore, P=1-120/343
Answered by Dawid
sum(dbinom(2:4,4,1/7)) = 0.1003748
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