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Question

Solve each of the following Cryptarithm:
AB7+7AB 9 8A¯

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Solution

If A + B = 8, A + B 9 is possible only if A = B = 9But from 7 + B = A, A = B = 9 is impossibleSurely, A + B = 8, A + B 9So, A + 7 = 9, Surely A = 27 + B = A, 7 + B = 2, B = 5So, A = 2, B = 5

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