Question

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Answer 1

Add all the no. U will get 21 (since u cannot divide it by 9)this shows that the no. Is not equal to 21.hence the answer is not divisible to 9

Hope it helps u mate

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Answer 2

First add all the digits in the number

1 + 0 + 8 +2 + 1 + 3 + 1 + 5

= 21 . 21 is not divisible by 9 and 10 the number 108 21315 is not divisible by 9