Question

if 4a3b is divisible by 11, find all possible values of a+b

Answer 1

Answer:

all possible values of a=4 and b=3

nothing either is

Answer 2

Given number is 4a3b

A number is divisible by 11 only if the difference between the sum of its alternate digits is divisible by 11

that means (4+3) - (a+b) is divisible by 11

that means 7 - (a+b) is divisible by 11

that means a+b = (-4) or (-15) or (-26) and so on....

Hope u got this