N is the set of all positive multiples of 3, and W s the set of all squares of integers. Which of the following numbers belongs to both sets?
(A) 3
(B) 16
(C) 25
(D) 36
(E) 72



Answer :

36 because 3 x 12 = 36 and [tex] 6^{2} [/tex] = 36

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