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=
Now check each option:
A. 28 = → 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 exceeds 2² in 252 → LCM will increase → cannot be x
Answer: Option D (56)