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  4. If A = 2, 4, 5 B = 7, 8, 9 then n (A × B) is equal to

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Q. If $A = \{2, 4, 5\}, B = \{7, 8, 9\}$, then $n (A \times B)$ is equal to

Relations and Functions

Solution:

$ n(A \times B) = n(A). n(B) = 3 \times 3 = 9$