A) \[\{(1,3),(2,3),(3,1),(3,2),(1,1),(2,1),(1,2)\}\]
B) \[\{(1,3),(3,1)(3,2),(2,3)\}\]
C) \[\{(1,3),(2,3),(3,2),(1,1)\}\]
D) None of these
Correct Answer: A
Solution :
[a] \[A\times B=\{1,2\}\times \{1,3\}=\{(1,1),(1,3),(2,1),(2,3)\}\] \[B\times A=\{1,3\}\times \{1,2\}=\{(1,1),(1,2),(3,1),(3,2)\}\] \[\therefore (A\times B)\cup (B\times A)\] \[=\{(1,1),(1,3),(2,1),(2,3),(1,2),(3,1),(3,2)\}\]
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