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One box has 9 bolts, 3 white and 6 red; and another box has

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Director
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Joined: 03 Jul 2003
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One box has 9 bolts, 3 white and 6 red; and another box has [#permalink] New post 29 Jan 2004, 12:33
One box has 9 bolts, 3 white and 6 red; and another box has 12 nuts, 5 white and 7 read. If I pick one bolt and a net from the respective boxes,
what is the probability of picking the same color bolt and nut?


What kind of probability question is this?
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Joined: 30 Oct 2003
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 [#permalink] New post 29 Jan 2004, 13:28
P = WB * WN + RB * RN

Picking Any bolt is independent of picking any nut
so p = 3/9 * 5/12 + 6/9 * 7/12 = 57/(12*9) = 19/36
  [#permalink] 29 Jan 2004, 13:28
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One box has 9 bolts, 3 white and 6 red; and another box has

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