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Question

If A×B= {(a,x),(a,y),(b,x),(b,y)}. Find set A and B.

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Solution

Given:
A×B= {(a,x),(a,y),(b,x),(b,y)}

Compare A×B and {(a,x),(a,y),(b,x),(b,y)}
We know that the cartesian product of two non-empty sets P and Q is given by : P×Q= {(p,q):p ϵ P,q ϵ Q}
Hence, A is set of all first elements and B is the set of all second elements.
A= {a,b}, B= {x,y}

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