What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?
Solution
Correct Answer: Option B
L.C.M. of 12, 18, 21, 30
= 2 x 3 x 2 x 3 x 7 x 5 = 1260
Required number = (1260 ÷ 2)=630.
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