If a certain coin is flipped, the probability that the coin : PS Archive
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# If a certain coin is flipped, the probability that the coin

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If a certain coin is flipped, the probability that the coin [#permalink]

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12 Nov 2006, 08:49
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If a certain coin is flipped, the probability that the coin will land heads is 1/2. If the coin is flipped 5 times, what is the probability that it will land heads up on the first 3 flips and not on the last 2 flips?

A. 3/5
B. 1/2
C. 1/5
D. 1/8
E. 1/32
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12 Nov 2006, 09:20
(E) for me

Since
o P(not head) = P(Tail) = 1/2

we have:

p(HHHTT) = 1/2*1/2*1/2*1/2*1/2 = 1/32
12 Nov 2006, 09:20
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