A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by Then, (a + b) =?
সমাধান
সঠিক উত্তর: Option A
4 a 3 9 8 4 13 b 7
so, the second digit a+8 = b
==> b -a = 8