Source: Official Guide for the GMAT 13th Ed. Problem Solving; #77 Official Guide for the GMAT 2015 14th Ed. Problem Solving; #77
The result of a sum is divisible by a number when every addend is divisible by that number.
n = 20! + 17
Since 20! is divisible by every integer from 1 to 20, lets check out which of the answers choices are divisible by 17.
Since 17 is the only answer choice divisible by 17, correct answer is: 17 only (C).
Jan 25, 2015 • Comment
Mike McGarry, Magoosh Tutor
Dec 27, 2013 • Comment
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