Question:R = {(x, y) : x`in NN`, y`in NN`  y = x + 1 R 

A {(0,1), (2, 1)} 
B {(1, 2), (3, 4)} 
C {(2, 3), (4, 2)} 
D {(4, 3), (2, 1)} 

+ Answer
B 

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Irin Moni

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