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What is the Cartesian product of $A=\{1,2\}$ and $B=\{a,b\}$?$\{(1,a),(1,b),(2,a),(b,b)\}$$\{(1,1),(2,2),(a,a),(b,b)\}$$\{(1,a),(2,a),(1,b),(2,b)\}$$\{(1,1),(a,a),(2,a),(...
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