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What will be the greatest number 32a78b, which is divisible by 3 but NOT divisible by 9? (Where a and b are single digit number) .
Question

What will be the greatest number 32a78b, which is divisible by 3 but NOT divisible by 9? (Where a and b are single digit number) .

A.

324781

B.

329787

C.

326787

D.

329784

Correct option is D

The number should be divisible by 3 is the sum of the numbers should be divisible by 3
The number should be divisible by 9 is the sum of the numbers should be 9
Again all the numbers divisible by 9 should be divisible by 3
then
Among the given options the sum of digits of option 1 , 2 and 3 is divisible by 9
But the sum of digits of of option (d) is 3 + 2 + 9 + 7 + 8 + 4 = 33 which is not divisible by 9 but divisible by 3

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