To check a number which is divisible by 11 or not , we need to summation of all even positions digits and subtraction of all odd(except 1) positions digits. if the result is divisible by 11 then the whole number is divisible is by 11, otherwise not.
example :- Is 56782431895057 divisible by 11?
solution :-
here, summation of digits is :
5+6-7+8-2+4-3+1-8+9-5+0-5+7 = 11
which is divisible by 11,
so, the number is divisible by 11.
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