A) {(1, 4, (2, 5), (3, 6),.....}
B) {(4, 1), (5, 2), (6, 3),.....}
C) {(1, 3), (2, 6), (3, 9),..}
D) None of these
Correct Answer: B
Solution :
\[R=\{(a,\,b):a,\,b\in N,\,a-b=3\}=\{((n+3),n):n\in N\}\] \[=\{(4,\,1),\,(5,\,2),\,(6,\,3),\,.....\}\].
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