Question

explain divisibility rule of 11 with an example

Answer 1

Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number. So, for instance, 2728 has alternating sum of digits 2-7+2-8 = -11. ... This is notdivisible by 11, so neither is 31415.

Answer 2

say 121 it is no with integer digits and the no. is positive. so we at first check whether addition of the even digits is equal to addition of odd digits or not? we have even digits as 2 and odd digits as 1 and 1 so adding up we have 2=1+1 implies that 2=2 so the number is divisible by 11