Question

If (4a2) is exactly divisible by 3, then the value of 'a' from the given options is :

• A. 0
• B. 1
• C. 2
• D. 3

Answer 1

The correct option is A

0

For a number to be divisible by 3, the sum of its digits should be exactly divisible by 3.
If a = 1; then the number becomes 412; the sum of the digit is 7 and is not divisible by 3.
If a = 2; the number becomes 422; the sum of the digit is 8 and is not divisible by 3.
If a= 4; the number becomes 442; the sum of the digit is 10 and not divisible by 3.

If a = 0; then the number becomes 402; the sum of the digit is 6 and is divisible by 3.
Hence the answer is a = 0