Question

if 3× 12 is a multiple of 3 and X is the digit then find the value of x
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Answer 1

The number is a multiple of 3, if sum of it's digits are multiple of 3.

i.e., 3+x+1+2 = 6 + x should be multiple of 3.

Therefore, possible values of x are 0, 3, 6, 9