What should replace * in the number 94*2357, so that the number is divisible by 11

What should replace * in the number 94*2357, so that the number is divisible by 11?

 (a) 3

(b) 7

(c) 1

 (d) 8

Sol:

For a number to be divisible by 11, the difference of sum of alternative numbers is

divisible by 11.

Hence, (7+3+*+9)-(5+2+4)

=(19+*)-(11)

=8+*

* must be 3 for 94*2357 to be divisible by 11.