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  4. If A= 1,3,5,7 B= a, b, c then n(A × B) is equal to

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Q. If $A=\{1,3,5,7\}, B=\{a, b, c\}$, then $n(A \times B)$ is equal to

NTA AbhyasNTA Abhyas 2022

Solution:

If $A$ contains $m$ elements and $B$ contains $n$ elements then $A \times B$ contains $m \times n$ elements.
Here, $n(A)=4, n(B)=3$
So, $n(A \times B)=4 \times 3=12$.