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  1. Which is the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?
    1. 2520
    2. 1260
    3. 630
    4. 196
Correct Option: C

We have , The LCM of 12, 18, 21, 30

∴ LCM = 2 × 3 × 2 × 3 × 7 × 5 = 1260

∴ The required number =
1260
 = 630
2


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