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# If a certain coin is flipped, the probability that the coin

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Director
Joined: 29 Aug 2005
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If a certain coin is flipped, the probability that the coin [#permalink]  15 Nov 2008, 10:15
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?

I will write the answers later.
VP
Joined: 05 Jul 2008
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Re: GMAT Set 28 - 17 [#permalink]  15 Nov 2008, 12:09
Yeah I got 1/32 too

HHHTT (or) HHH!H!H

H is 1/2 and !H is also 1/2

so (1/2)^5 = 1/32
Re: GMAT Set 28 - 17   [#permalink] 15 Nov 2008, 12:09
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