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Question
Solve each of the following Cryptarithm:
A 1
+ 1 B
B 0
Sum
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Solution
\[\text{ If }1 + B = 0 \]
\[\text{ Surely, }B = 9\]
\[\text{ If }1 + A + 1 = 9 \]
\[\text{ Surely, } A = 7\]
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