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A couple has two children, (ii) Find the probability that both children are females ,if it is known that the elder child is a female.

Q .2   A couple has two children,

            (ii) Find the probability that both children are females, if it is known that the elder child is a female.

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  A couple has two children,

 sample space =\left \{ (b,b),(g,g),(b,g),(g,b) \right \}

Let A be both children are females and B be  the elder child is a female.

(A\cap B)=\left \{ (g,g) \right \}

P(A\cap B)=\frac{1}{4}

P(A)=\frac{1}{4}

P(B)=\frac{2}{4}

P(A|B)=\frac{P(A\cap B)}{P(B)}

P(A|B)=\frac{\frac{1}{4}}{\frac{2}{4}}=\frac{1}{2}

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