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Date tag: January 4 2010 7:43:57

The test for divisibility by 4 works because 100 is divisible by 4. Why does the test for 9 work Because 10 equals 9 plus 1

Date tag: January 4 2010 7:38:41

N is not divisible by 4. We know this because the last two digits, 34 form an integer which is not divisible by 4. N is divisible by 9 because the sum of digits of N is 45 which is divisible by 9.

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