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

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

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10 Jul 2006, 18:01
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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
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10 Jul 2006, 19:34

[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

10 Jul 2006, 19:34
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