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A couple has 2 children. Find the probability that both are boys, if it is known that 

(i) One of them is a boy 

(ii) The older child is a boy.

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Sample space = {B1B2, B1G2, G1B2, G1G2},

B1 and G1 are the older boy and girl respectively.

Let    E1 = Both the children are boys;

     E=  One of the  children is a  boys;

    E3 = The older child is a boy 

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