Q.

The least common multiple of 135 and 24 is

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a

1080

b

90

c

240

d

360

answer is D.

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Detailed Solution

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LCM stands for Lowest common multiple, and it is the smallest common multiple between any two or more numbers. 

Let us write the numbers as their prime factors.

Now, 135 = 3 × 3 × 3 × 5 × 1 or 33 × 5 × 1. 

and 24 = 2 × 2 × 2 × 3 × 1 or 23 × 3 × 1.
Also, LCM in terms of prime factors, is the product of the greatest power of each prime factor of the numbers taken.
Therefore, 

LCM = 23 ×33 × 5 = 1080

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