Question

A four digit number abcd is divisible by 11 if only
A.(a+b)-(c+d) is divisible by 11
B.(a-c)-(b-d) is divisible by 11
C.(a-c)-(b+d) is divisible by 11
D.(b+d)-(a+c) is divisible by 11
The coerrect answer is 'D' but how?

Answer 1

To check the divisibility of abcd by 11, the following rule is followed:
( a + c ) = ( b + d )
Let's Take An Example.
Check Weather 2541 is divisible by 11 or not.
2 + 4 = 6
5 + 1 = 6
So, we can say that 2541 is divisible by 11.