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What is the conditional probability that exactly four heads appear when a fair coin is flipped five times, given that the first flip came up heads?

shouldn’t the answer be 1/16?

my approach
probability that we get 4 head after 4 toss=(1/2)^4
probability that outcome of first toss is head=½
P(A/B)=P(A ∩ B)/P(B)=$\frac{(1/2)^4*1/2}{1/2}$
 

answer is given ¼?

where am I going wrong?

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