NCERT Example - Cryptarithm A1 + 1B = B0 - Number Play

Question: Solve the cryptarithm A1 + 1B = B0, where each letter is a digit, A and B are different, and leading digits are not 0.

Answer: A = 7, B = 9 (71 + 19 = 90).

Full step-by-step NCERT solution with diagrams on Something by Zero.