Rules for Divisibility :
10. Divisibility by 11 : A number is divisible by 11 if the difference of the sum of the digits at odd places and sum of the digits at even places is either zero or divisible by 11.
For example, in the number 38797, the sum of the digits at odd places is
3 + 7 + 7 = 17 and the sum of the digits at even places is 8 + 9 = 17. The different is 17 – 17 = 0, so the number is divisible by 11.
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