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A coin is thrown 5 times-, what is the probability first

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Director
Director
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Joined: 08 Jul 2004
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A coin is thrown 5 times-, what is the probability first [#permalink] New post 29 Sep 2004, 07:40
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A coin is thrown 5 times-, what is the probability first three all being head up and latter two both not being headup?
Director
Director
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Joined: 20 Jul 2004
Posts: 593
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Kudos [?]: 23 [0], given: 0

 [#permalink] New post 29 Sep 2004, 08:18
I have been too dumb today. I see it as a simple 1/32.
Is there anything hidden?
Director
Director
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Joined: 08 Jul 2004
Posts: 606
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Kudos [?]: 36 [0], given: 0

 [#permalink] New post 29 Sep 2004, 08:22
No you are very bright. I don't know anything hdden or not. Can you please explain how you got this answer?
Thanks a ton
S
Director
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Joined: 20 Jul 2004
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Kudos [?]: 23 [0], given: 0

 [#permalink] New post 29 Sep 2004, 08:27
Huh, some releif. :-D

Total number of cases = 2^5 (2 for each flip of the coin) = 32
Favourable case = 1 (In general you'd see problems requiring 3H and 3T, where we try to arrange Hs and Ts. In this problem, they have defined their favourite spots themselves - first 3 are H and last 2 are Ts)
Pb = 1/32
  [#permalink] 29 Sep 2004, 08:27
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A coin is thrown 5 times-, what is the probability first

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