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

Problems on L.C.M and H.C.F 21/04/2021

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.

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