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

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Joined: 08 Apr 2004
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If a certain coin is flipped, the probability that the coin [#permalink] New post 26 Aug 2004, 21:13
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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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Joined: 07 Jul 2004
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Location: Singapore
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 [#permalink] New post 26 Aug 2004, 21:50
Number of combinations:2^5 = 32
Only 1 combination gives you HHHTT, so probaility is 1/32

You can also solve it this way: HHHTT = 1/2 * 1/2 * 1/2 * 1/2 * 1/2
= 1/32
  [#permalink] 26 Aug 2004, 21:50
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If a certain coin is flipped, the probability that the coin

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