A family has two children. What is the probability that both are girls, given that at least one is a girl?

Explanation:

Here are all of the ways to list the sample space. B = boy, G = girl

BB

BG

GB

GG

We see that there are 3 cases in which there is at least one girl in the family. There is only one case where we have both children being girls. So the probability is 1/3.

In other words, we don't focus on the case BB since we know that at least one child is a girl, so we just focus on {BG, GB, GG}, and we note that GG only happens once out of the three possibilities.

126 maybe. sorry

the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3