Question

If 45A is divisible by 9 , then A = __________

• A. 2 or 3
• B. 0 or 9
• C. 3 or 9
• D. Only 0

Answer 1

The correct option is B

0 or 9

A number is divisible by 9 , if the sum of its digits is divisible by 9

$\Rightarrow$ 4 + 5 + A should be divisible by 9

$\Rightarrow$ 9 + A= 0 , 9 , 18 , 27, 36..............

$\Rightarrow$ A= -9 , 0 , 9 , 18, 27..............

Since A is a single digit and cannot be a negative number , it can either be equal to 0 or 9