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# The probability of rain on each of five days is 1/6, except

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Manager
Joined: 15 Jul 2004
Posts: 73
The probability of rain on each of five days is 1/6, except [#permalink]

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09 Apr 2005, 01:15
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Question Stats:

100% (01:33) correct 0% (00:00) wrong based on 3 sessions

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The probability of rain on each of five days is 1/6, except on the first
day, when it is 2/5, and on the last day, when it is 4/5. What is the
probability that rain will occur on at least one of the five days?
(A) 1/675
(B) 5/72
(C) 5/27
(D) 22/27
(E) 67/72
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===========================
Let us make hay while the sun shines.
Don Quixote. Part i. Book. iii. Chap. xi.

VP
Joined: 30 Sep 2004
Posts: 1480
Location: Germany

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09 Apr 2005, 01:33
E)

1 - p(no rain) = 1 - (3/5*5/6*5/6*5/6*1/5) = 67/72
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If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

09 Apr 2005, 01:33
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