Question

solve this cryptarithm using the digits 0 through 9 where each letter represents a digit and no digit can be represented by two different letters. all digits may not be used

USSR+USA=Peace

I have tried to work all day and do not understand

Step 1

We assume all letters have values between 0 and 9

Now,

U S S R

+ U S A

=P E A C E

So, the highest that S+U can carry to U is 1 (9 + 8 = 17 = 10 + 7).

Let us consider the ones column (A + R =E) as E is 0, then A + R must be 10 and forward 1 as a carry to the ten’s column.

Now, applying the trial and error method

- Starting from one’s column...

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