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# In Rwanda, the chance for rain on any given day is 50%. What

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Joined: 30 Mar 2006
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Kudos [?]: 2 [0], given: 0

In Rwanda, the chance for rain on any given day is 50%. What [#permalink]  10 Jul 2006, 17:01
23. In Rwanda, the chance for rain on any given day is 50%. What is the probability that it rains on 4 out of 7 consecutive days in Rwanda?

a) 4/7
b) 3/7
c) 35/128
d) 4/28
e) 28/135

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Andre Crompton
andre.crompton@cit.com

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Joined: 20 Nov 2005
Posts: 2910
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
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Kudos [?]: 132 [0], given: 0

[7!/(4!*3!)] * (1/2)^4 * )1/2)^3 = 35/128

For explanation see in the end of this post.

http://www.gmatclub.com/phpbb/viewtopic.php?t=31621
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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