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.
