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+1 vote
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in Mathematics by (60.8k points)
A family has 2 children. Find the probability that both are boys, if it is known that

(i) at least one of the children is a boy (ii) the elder child is a boy.

1 Answer

+1 vote
by (52.9k points)
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Best answer

family has 2 children, then
Sample space = S = {BB, BG, GB, GG}
where B = Boy, G = Girl
(i) Let us define the following events:
A: at least one of the children is boy : {BB, BG, GB }
B: both are boys: { BB }

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