Solve the following cryptarithm:
$A B 7$
$+ 7 A B - ------- -$
$98 A - ----- -$

A = 2, B = 5

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A = 7, B = 5

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A = 2, B = 8

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None of these

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Solution

The correct option is A $A = 2, B = 5$
$A B 7 + 7 A B = 98 A, (100 A + 10 B + 7) + (700 + 10 A + B) = 900 + 80 + A, 7 + B = A, B + A = 8, A + 7 = 9, A = 2, I f B = 6, f i r s t e q u a t i o n i s i n v a l i d, 7 + B = 10 + A, B + A = 7, i . e, A = 2, B = 5$

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