In the following, find the digits represented by the letters:
1 6
+ 2 A–––––––
B 1––––––
In the given problem, the addition of 6 and A is giving 1 that is a number whose one's digit is 1. In that case addition of 6 and A=5 will give 11 and thus 1 will be carried for the next step. In the next step,
1+1+2=B⇒B=4
Hence, the letters
A=5 and
B=4.