Question

A couple has two children find the probability that both are boys if it is know that the older child is a boy
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Answer 1

Answer:

1/2

Step-by-step explanation:

as we know that 1 guy is boy,the other should be known if he is boy or girl.as there are 2 outcome,prob is 1/2

Answer 2

Answer:

Let

A : elder boy child : { BB, BG }

B : both are boys : { BB }

Therefore A intersection B : { BB }

P ( B intersection A) = P( A intersection B) /P(A)

= 1/4÷2/4

= 1/2