Question

A number is divisible by 11, if the _____ of the sum of digits at even places and the sum of the digits at odd places is divisible by 11.

Answer 1

A number is divisible by 11, if the DIFFERENCE of the sum of digits at even places and the sum of the digits at odd places is divisible by 11.

Answer 2

A number is divisible by 11, if the difference of the sum of digits at even places and the sum of the digits at odd places is divisible by 11.

Example:-

2728

→ (8+7)-(2+2)

→ 15-4

→ 11 is a multiple of 11

So it is divisible.

Hope it helps