Test the divisibility of a number $326, 999$ by $9$

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Solution

We know thar a number is divisible by $9$ ,if the sum of its digits is divisible by $9$ .
Sum of digits $= 3 + 2 + 6 + 9 + 9 + 9 = 38$
which is not divisible by $9$
Hence $326, 999$ is not divisible by $9$ .

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