SSC MTS Model Paper 2

Question : 29 of 150

Marks: +1, -0

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

Solution:

(3) The LCM of 12, 18, 21, 30

∴ LCM = 2 × 3 × 2 × 3 × 7 × 5 = 1260
∴ The required number

1260/2=630

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