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When four fair dice are rolled simultaneously, in how many

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When four fair dice are rolled simultaneously, in how many [#permalink] New post 26 Oct 2003, 02:08
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When four fair dice are rolled simultaneously, in how many outcomes will at least one of the dice show 3?

(1) 155 (2) 625
(3) 626 (4) 671
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 [#permalink] New post 26 Oct 2003, 07:35
N=all the possible outcomes-the outcomes having no 3s.

All=6^4
wrong=5^4

N=(6^4)-(5^4)=(36-25)*(36+25)=11*61=671
  [#permalink] 26 Oct 2003, 07:35
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