We have three numbers 2, 4, 7. Find the LCM of these numbers.

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Solution

The correct option is A 28
For finding the LCM, we can use the following procedure:
Arrange the given numbers in a row in any order. Divide by a number which divides exactly at least two of the given numbers and carry forward the numbers which are not divisible. Repeat the above process till no two of the numbers are divisible by the same number except 1. The product of the divisors and the undivided numbers is the required L.C.M. of the given numbers.

The LCM will be the product of 2 × 2 × 7 = 28

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