Which is the least number which when double will be exactly divisible by 12, 18, 21 and 30?

Which is the least number which when double will be exactly divisible by 12, 18, 21 and 30?
[A]196
[B]630
[C]1260
[D]2520

630
The LCM of 12, 18, 21, 30 is 1260.
∴ The required Number =
= \frac{1260}{2} = 630
Hence option [B] is correct answer.

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