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Question
Let A = {1, 2, 3, 4} and B = {5, 7, 9}. Determine is n (A × B) = n (B × A)?
Solution
Since A = {1, 2, 3, 4} and B = {5, 7, 9}.
Therefore, n(A × B) = n(A) × n(B)
= 4 × 3
= 12
n(B × A) = n(B) × n(A)
= 4 × 3
= 12
Hence n(A × B) = n(B × A)
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