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Sum

Let A and B be two sets such that n (A) = 3 and n(B) = 2. If (x, 1), (y, 2), (z, 1) are in A × B, find A and B, where x, y, z are distinct elements

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#### Solution

n(A) = 3 ⇒ set A contains 3 elements

n(B) = 2 ⇒ set B contains 2 elements

We are given (x, 1), (y, 2), (z, 1) are elements in A × B

⇒ A = {x, y, z} and B = {1, 2}

Concept: Introduction to Sets, Relations and Functions

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