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A $3$ -digit number 'cba' is divisible by $9$ if

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a + 2 b + c

is divisible by

9

2 a + b + c

is divisible by

9

a + b + 2 c

is divisible by

9

a + b + c

is divisible by

9

answer is D.

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Detailed Solution

The given three digit number is cba.
We know that, a number is divisible by

9

if the sum of the digits is divisible by

9

.
For the number ‘cba’ to be divisible by

9

.
(a+b+c) should be divisible by

9 .

Therefore, the correct option is 4).

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