Write the rules for test of divisibility
1) divisibility by 9
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Sum of digits should be divisible by 3 or 9
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If the sum of the digits of a number is divisible by 9, then the number is divisible by 9. Some examples of numbers divisible by 9 are as follows. The number 51984 is divisible by 9 because the sum of its digits 5+1+9+8+4=27 is divisible by 9.
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