If abcd=390, where a, b, c and d are positive integers, and a<b<c<d, which of the following could be the value of da?
A) 9
B) 10
C) 11
D) 13
E) 15
OE:
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A) 9
B) 10
C) 11
D) 13
E) 15
OE:
[Reveal] Spoiler:
Prime factors of 390 = 2, 3, 5, 13
One possible value for the variables in the question is a=2, b=3, c=5, d=13.
-> d - a = 13 - 2 = 11, so 11 is a possible value for d - a
One possible value for the variables in the question is a=2, b=3, c=5, d=13.
-> d - a = 13 - 2 = 11, so 11 is a possible value for d - a