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Which of the following is NOT a factor of 20!?

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Senior Manager
Senior Manager
Joined: 20 May 2014
Posts: 282
Followers: 14

Kudos [?]: 49 [0], given: 220

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Which of the following is NOT a factor of 20!? [#permalink] New post 10 Oct 2017, 20:22
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Question Stats:

0% (00:00) correct 100% (00:13) wrong based on 4 sessions
Which of the following is NOT a factor of 20!?

A. 17
B. 21
C. 25
D. 29
E. 42
F. 51
G. 85
H. 121

OA:
[Reveal] Spoiler:
D. and H.



Kudos for correct solution.
[Reveal] Spoiler: OA
Director
Director
Joined: 20 Apr 2016
Posts: 743
Followers: 6

Kudos [?]: 500 [0], given: 86

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Re: Which of the following is NOT a factor of 20!? [#permalink] New post 10 Oct 2017, 21:26
Bunuel wrote:
Which of the following is NOT a factor of 20!?

A. 17
B. 21
C. 25
D. 29
E. 42
F. 51
G. 85
H. 121

OA:
[Reveal] Spoiler:
D. and H.



Kudos for correct solution.


20! = 20 * 19 * 18 * 17 * 16 * 15 * 14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1

Now 29 is not a factor as 20! donot contain 29

Next 121 i. e = 11 * 11 , but we have only one 11, so it can't be a factor of 20!

Hence option D and H
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Re: Which of the following is NOT a factor of 20!?   [#permalink] 10 Oct 2017, 21:26
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Which of the following is NOT a factor of 20!?

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