You toss 3 coins. What is the probability that you get exactly 2 heads, given that you get at least one tail? A tree diagram will help you to answer this question.

Question

anonymous · Answer

I think its 3/8 but I'm not sure can anyone confirm?

anonymous · Answer

You're supposed to make it, also things like htt hhh hth serve the same purpose

anonymous · Answer

it is not 3/8 because there are not 8 elements in your sample space
the "given that you get at least one tail" means that HHH is out, so there are only seven elements in your sample space

anonymous · Answer

Oh, so is it 3/7?

anonymous · Answer

7 is not such a big number that we cannot list all the possibilities

anonymous · Answer

$$HHT\
HTH\
THH\
TTH\
THT\
HTT\
TTT$$ are the seven

anonymous · Answer

notice that HHH is missing

anonymous · Answer

of those , 3 have exactly two heads

anonymous · Answer

oh what you said ages ago
$\frac{3}{7}$

anonymous · Answer

Yes, I do, thanks