Question

In a two children family, find the probability that there is at least one girl in a family

Answer 1

Sample space (S) = {(Boy, Boy) (Boy, Girl) (Girl, Boy) (Girl, Girl)}

n(S) = 4

Let A be the event of getting atleast one Girl

A = {(Boy, Girl) (Girl, Boy) (Girl, Girl)}

n(A) = 3

P(A) = `("n"("A"))/("n"("S")) = 3/4`

 Probability of at least one girl in a family is `3/4`