If x>5 and y<21, and x and y are prime numbers, what is the least value of xy?

(A) 4

(B) 10

(C) 14

(D) 19

(E) 133

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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372

2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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