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The LCM of 63, 36 and x is 252. Which of the following options CANNOT be a value of x?
Question

The LCM of 63, 36 and x is 252. Which of the following options CANNOT be a value of x?

A.

28

B.

42

C.

14

D.

56

Correct option is D

Given:

LCM of 63, 36, and x is 252.

We are to find which option cannot be a value of x.

Solution:
If LCM(63, 36, x) = 252, and LCM(63, 36) = 252,
then x must be a factor of 252.

Prime factorization of 252:

252= 22×32×72^2 \times 3^2 \times 7

Now check each option:

A. 28 =22×7 2^2 × 7​ → factors are in 252 → can be x

B. 42 = 2 × 3 × 7 → factors are in 252 → can be x

C. 14 = 2 × 7 → factors are in 252 → can be x

D. 56 = 23×72^3 × 7 ​→ 2³ exceeds 2² in 252 → LCM will increase → cannot be x

Answer: Option D (56)

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