Using divisibility tests, determine the given number $7, 57, 900$ is divisible by $9$ .

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Solution

We know that a number is divisible by $9$ , if the sum of its digits is divisible by $9$ .
Here, the sum of the digits of the given number $7, 57, 900$ is $7 + 5 + 7 + 9 + 0 + 0 = 28$ , which is not divisible by $9$ .
Therefore, the given number is not divisible by $9$ .

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