A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a b) = ?

A 3-digit number 4a3 is added to another 3-digit number 984 to give a

1.	A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a b) = ?
A.	11
B.	10
C.	15
D.	12
Answer» C. 15