You toss 3 coins . What is the probability that you get exactly 2 heads, given that you got at least 1 head? A tree diagram will help you answer this question
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There is one possibility where you get no heads.
There are three possibilities where you get 1 head.
There are three possibilities where you get 2 heads.
There is one possibility where you get 3 heads.
But we don't count the possibility where you get no heads at all. So we only have seven possibilities that we're dealing with.
So, the odds are 3/7.
I think its 1/2.
The tree diagram shows 8 equally likely possible outcomes. We must exclude the TTT outcome because it is given that you get at least 1 head.
Count all of the branch paths that show exactly 2 heads. There are 3 of them. There are 7 possible outcomes because we eliminated one of them.
Therefore, the probability of getting exactly 2 heads in this problem is 3/7.