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Problems on HCF and LCM - General Aptitude

Q1:

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

A 196

B 630

C 1260

D 2520

ANS:B - 630 

L.C.M. of 12, 18, 21 30 2 | 12 - 18 - 21 - 30 --------------------