Question

explain divisibal rule of 11 worth an example

Answer 1

Divisibility rule of 11 : If the difference between the sum of digits at even and odd places comes as multiple of 11 or 0, then the no. is divisible by 11

For eg.  121     , The digits at odd places are 1 , 1. Their sum = 2
                          The digits at even places are 2    
                         Their difference = 2-2 = 0
∴ It is divisible by 11.

Eg.(2) >>   3080308

 The digits at odd places >> 3 , 8 , 3, 8 . Their sum = 11+11 = 22
The digit at even places >> 0.
Their difference = 22-0 = 22 ( Multiple of 11 )
∴ It is divisible by 11.

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