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A 10-student class is to choose a president, vice president, and secre

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A 10-student class is to choose a president, vice president, and secre  [#permalink]

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New post 17 Dec 2018, 00:23
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

76% (00:32) correct 24% (00:42) wrong based on 33 sessions

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A 10-student class is to choose a president, vice president, and secretary from the group. If no person can occupy more than one post, in how many ways can this be accomplished?

A. 72
B. 80
C. 90
D. 120
E. 720

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Re: A 10-student class is to choose a president, vice president, and secre  [#permalink]

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New post 17 Dec 2018, 01:31
Bunuel wrote:
A 10-student class is to choose a president, vice president, and secretary from the group. If no person can occupy more than one post, in how many ways can this be accomplished?

A. 72
B. 80
C. 90
D. 120
E. 720


No of ways to choose a president=10C1
No. of ways to choose a vice president=9c1
No of ways to choose a sectary=8C1

Total no of ways=10C1*9C*8C1=720
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Re: A 10-student class is to choose a president, vice president, and secre  [#permalink]

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New post 17 Dec 2018, 01:47
Bunuel wrote:
A 10-student class is to choose a president, vice president, and secretary from the group. If no person can occupy more than one post, in how many ways can this be accomplished?

A. 72
B. 80
C. 90
D. 120
E. 720



total ways to select one of each category:

10*9*8= 720 IMO E
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Re: A 10-student class is to choose a president, vice president, and secre &nbs [#permalink] 17 Dec 2018, 01:47
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A 10-student class is to choose a president, vice president, and secre

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