Question

If 12a6 is a multiple of 3, where ‘a’ is a digit. What is the value of a?
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Answer 1

Answer:

12a6 is multiple of 3, so sum of digits of the number should be a multiple of 3

1+2+a+6 should be multiple of 3

9+a should be multiple of 3

a can take values 0,3,6,9 as only these numbers added with 9 can satisfy the above condition