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5 marbles in a bag : 2 red, 3 blue Random pick of 2 of them

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Director
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Joined: 31 Aug 2004
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5 marbles in a bag : 2 red, 3 blue Random pick of 2 of them [#permalink] New post 04 Sep 2004, 05:58
5 marbles in a bag : 2 red, 3 blue
Random pick of 2 of them simultaneously
Prob that at least 1 of the marbles will be red ?

A 2/5
B 6/10
C 7/10
D 15/20
E 19/20
Manager
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 [#permalink] New post 04 Sep 2004, 06:11
7/10
i feel very mch better
_________________

Jim

Director
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Joined: 16 Jun 2004
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 [#permalink] New post 04 Sep 2004, 06:14
(2C1*3C1)/5C2 + 2C2/5C2 = 7/10
  [#permalink] 04 Sep 2004, 06:14
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5 marbles in a bag : 2 red, 3 blue Random pick of 2 of them

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