A number is divisible by 11,

Question:

 A number is divisible by 11, if the differences between the sum of digits at its odd places and that of digits at the even places is either 0 or

divisible by ————-.

Solution:

11

By test of divisibility by 1,1, we know that, a number is divisible by 11, if the sum of digits at odd places and even places are equal or differ by a

number, which is divisible by 11.

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