Fifteen airmen are in the line crew. They must take care of : PS Archive
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# Fifteen airmen are in the line crew. They must take care of

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Manager
Joined: 19 Jun 2003
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Fifteen airmen are in the line crew. They must take care of [#permalink]

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09 Aug 2004, 12:43
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Fifteen airmen are in the line crew. They must take care of the coffee mess and line shack cleanup. They put slips numbered 1 through 15 in a hat and decide that anyone who draws a number divisible by 5 will be assigned the cof�fee mess and anyone who draws a number divisible by 4 will be assigned cleanup. The first person draws a 4, the second a 3, and the third an 11. What is the probability that the fourth person to draw will be assigned

a. the coffee mess?

b. the cleanup?

enjoy!
Director
Joined: 05 May 2004
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09 Aug 2004, 15:28
for 4th person - 12 nums are left
a. coffee mess - div by 5 - 5,10,15 - prob=3/12=1/4
b. cleanup - div by 4 - 8,12 - prob = 2/12=1/6
Manager
Joined: 28 Jul 2004
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09 Aug 2004, 16:32
cool, 1/4 and 1/6 for coffee mess and clean up respectively
09 Aug 2004, 16:32
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