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Question

Given
A A A
+ A A
--------------
A B B
If B5, what could be a possible value of B ?

A
0
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B
8
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C
6
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D
6 or 8
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Solution

The correct option is C 6 or 8
A A A
+ A A
A B B
Which means no carry over, thus A will be smaller than 5 and hence B will be smaller than 9.
If B5, then B = 6 or 8 as B = 2× A.
So, option D.

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