The Facebook question was "What's the chance one of my Facebook friends was born in May?" My answer: Months that are not May = 11. The month that is May = 1, the number of Facebook friends I have = 350. Therefore, P(A) where A=none of my Facebook friends was born in May, P(A)=(11/1)^350. I say that is a probability of 9.15537170E+150/1 So, very likely one of them was born in May.
Am I wrong?