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What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?

/ Mathematics Mcqs, Problems on L.C.M and H.C.F / By
What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?

A. 196
B. 630
C. 1260
D. 2520
Explanation:
L.C.M of 12, 18, 21, 30
= 2 * 3 * 2 * 3 * 7 * 5 = 1260
Required number = 1260/2 = 630.