Question

The sum of first three common multiples of 3, 4 and 9 is
(A) 108 (B) 144 (C) 252 (D) 216

Answer 1

Multiples of
3 = 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36
4 = 4, 6, 12, 16, 20, 24, 28, 32, 36
9 = 9, 18, 27, 36, 45

Answer is 36 × 3
= 108