Question:(x + y, 0) = (1, x - y) হলে (x, y) = কত? 

A (0, 0) 
B (1, 1) 
C (2, 2) 
D `(1/2, 1/2)` 

+ Answer
D 

+ Explanation
(x + y, 0) = (1, x - y)

     x + y = 1 0 = x - y

     :. x + x = 1   x = y

      2x = 1

    `:. x = 1/2`  `y = 1/2`

     :. (x, y) = `(1/2, 1/2)`

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