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Question
A 1
+ 1 B
B 0
Solution
B = 9 as 9 + 1 = 10.
We want 0 at units place and 1 is carry over.
Now B - 1 -1 = A.
∴ A = 9 - 2 = 7
Hence A + 7 and B = 9
7 1
+ 1 9
9 0
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