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A committee of three is chosen form a group consisting of 5

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Manager
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A committee of three is chosen form a group consisting of 5 [#permalink] New post 09 Oct 2003, 20:39
A committee of three is chosen form a group consisting of 5 men and 4 women. If the selection is made at random, find the probability that
a. all 3 are women
b. 2 are men
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Re: Probability#13 [#permalink] New post 09 Oct 2003, 23:44
araspai wrote:
A committee of three is chosen form a group consisting of 5 men and 4 women. If the selection is made at random, find the probability that
a. all 3 are women
b. 2 are men


a. all 3 are women

4C3/ 9C3

b. 2 are men

5C2 * 4C1 / 9C3
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 [#permalink] New post 13 Oct 2003, 22:43
a. agree
b. the stem does not specifically say EXACTLY two men, so I think we have to consider 2 cases: 2 men +1 woman, and 3 men.

P=(5C2*4C1+5C3*4C0)/9C3
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 [#permalink] New post 13 Oct 2003, 23:19
stolyar wrote:
a. agree
b. the stem does not specifically say EXACTLY two men, so I think we have to consider 2 cases: 2 men +1 woman, and 3 men.

P=(5C2*4C1+5C3*4C0)/9C3


it doesnt say "atleast"..yours assumption goes a bit too far

thanks
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 [#permalink] New post 13 Oct 2003, 23:35
It is you who assumes that the third person is a woman.
Negate the assumption: the third person is a man, the conclusion—there are two men—is not harmed. Therefore, your assertion is not an assumption, and we have to consider two cases.
  [#permalink] 13 Oct 2003, 23:35
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A committee of three is chosen form a group consisting of 5

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