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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

CAT Tests
Which of the following is NOT a factor of 20!? [#permalink] New post 05 Nov 2017, 01:44
00:00

Question Stats:

66% (00:55) correct 33% (-2:-18) wrong based on 3 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

Kudos for correct solution.

[Reveal] Spoiler: OA
D. and H.
[Reveal] Spoiler: OA
Director
Director
Joined: 03 Sep 2017
Posts: 521
Followers: 1

Kudos [?]: 327 [0], given: 66

Re: Which of the following is NOT a factor of 20!? [#permalink] New post 05 Nov 2017, 03:05
In order not to be a factor of 20!, a number must no be between 1 and 20 and it cannot be computed as the product of numbers contained in 20!. Ths means that 29, which is prime and greater than 20 and 121 which is 11*11 and in 20! we have just one 11 are not factors of 20! Answers D and H.

The others are either between 1 and 20 such as 17 or they can be computed as products of factors of 20! such as 42 = 6*7.
Re: Which of the following is NOT a factor of 20!?   [#permalink] 05 Nov 2017, 03:05
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Which of the following is NOT a factor of 20!?

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