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प्रश्न
Test the divisibility of the following numbers by 9:
257106
उत्तर
A number is divisible by 9 if the sum of its digits is divisible by 9.
257106 is not divisible by 9, because the sum of its digits, 2 + 5 + 1 0 + 6, is 21, which is not divisible by 9.
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