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17 Aug 2017, 01:03
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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Which of the following is NOT a factor of 20!?
I. 29
II. 85
III. 121
A. I only
B. II only
C. III only
D. I and II
E. I and III
I. 29
II. 85
III. 121
A. I only
B. II only
C. III only
D. I and II
E. I and III
17 Aug 2017, 01:21
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I think answer is E
1.29
There is no 29 in 20!. So it is not a factor
2.85
85 can be written as 5*17. Both numbers can be found in 20!.So it is a factor
3.121
121 =11*11. There is only one 11 in 20! So it is not a factor of 20!
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1.29
There is no 29 in 20!. So it is not a factor
2.85
85 can be written as 5*17. Both numbers can be found in 20!.So it is a factor
3.121
121 =11*11. There is only one 11 in 20! So it is not a factor of 20!
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Expert reply
17 Aug 2017, 12:45
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1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
20! has to have it's units digit be a 0
The only divisible factor of 0 is 5 and 0, so the answer that fits this is 85. So, the answer is (E): I and III
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
20! has to have it's units digit be a 0
The only divisible factor of 0 is 5 and 0, so the answer that fits this is 85. So, the answer is (E): I and III
