check my answer please:
When three fair coins are tossed, calculate the conditional probability that two heads and a tail turn up, given that first coin came up heads.
P(A) is that 2 heads and 1 tail
P(B) is 1 one is heads.
since we are considering that first one is going to be heads, then P(a) is 1 head and 1 tail?
so (1/4) / (1/2)

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