1 2 A
+ 6 A B
________
A 0 9 _
∵ 10 - 2 = 8
∴ A = 8
Also 9 - 8 = 1 ∴ B = 1
Now we have 1 2 8
+ 6 8 1
Thus, A = 8 and B = 1 _______
8 0 9
Thus, A = 8 and B = 1