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John A
Boy/Girl probability paradox?
At the mall you run into a high school classmate whom you haven't seen in years. While catching up on each others lives, she mentions she has two children.
A. Assume that you already know your classmate has a son. What is the probability that both her children are boys?
A moment later, a boy comes running up to her and says, "Hi, Mom." Your classmate then says, "This is my youngest child."
B. Now, what is the probability that both her children are boys?
Are the probabilities of A. and B. the same or different? If different, explain why.
7 AnswersMathematics1 decade ago