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George owns twelve audio compact discs. If he takes two of them

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George owns twelve audio compact discs. If he takes two of them  [#permalink]

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08 Oct 2014, 03:27
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Question Stats:

80% (00:36) correct 20% (00:44) wrong based on 75 sessions

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George owns twelve audio compact discs. If he takes two of them to play on an upcoming car trip, how many different pairs of compact discs could he choose?

(A) 144
(B) 132
(C) 72
(D) 66
(E) 36

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Re: George owns twelve audio compact discs. If he takes two of them  [#permalink]

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08 Oct 2014, 03:31
Gnpth wrote:
George owns twelve audio compact discs. If he takes two of them to play on an upcoming car trip, how many different pairs of compact discs could he choose?

(A) 144
(B) 132
(C) 72
(D) 66
(E) 36

$$C^2_{12}=66$$.

Answer: D.
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Re: George owns twelve audio compact discs. If he takes two of them  [#permalink]

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21 Mar 2020, 06:04
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Re: George owns twelve audio compact discs. If he takes two of them   [#permalink] 21 Mar 2020, 06:04

George owns twelve audio compact discs. If he takes two of them

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