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

  • A. 630
  • B. 630
  • C. 630
  • D. 630

Answer: Option A

Explanation:

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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