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27 Dec 2016, 09:02
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Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
69% (01:02) correct
31%
(01:03)
wrong
based on 147
sessions
History
Date
Time
Result
Not Attempted Yet
What is the greatest value of x such that 10^x is a factor of 20! ?
A. 1
B. 2
C. 3
D. 4
E. 5
A. 1
B. 2
C. 3
D. 4
E. 5
27 Dec 2016, 11:16
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Bunuel
10 = 2*5
The highest value of 2 in 20! will be - 18
20/2 = 10
10/2 = 5
5/2 = 2
2/2 = 1
The highest value of 5 in 20! will be - 4
20/5 = 4
Since, there are fewer 5's than 2 , the greatest value of x such that 10^x is a factor of 20! will be x = 4
Hence, correct answer will be (D) 4
