If X= A. B, then X is ‘1’ when

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9 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

If X= A. B, then X is ‘1’ when

A = 1, B = 1

A = 0, B = 0

A = 1, B = 0

A = 0, B = 1