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Question
Test the divisibility of the following numbers by 9:
647514
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Solution
A number is divisible by 9 if the sum of its digits is divisible by 9.
647514 is divisible by 9, because the sum of its digits, 6 + 4 + 7 + 5 + 1 + 4, is 27, which is divisible by 9.
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