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