If the set $A$ has $3$ elements and the set $B = (3, 4, 5)$ find the number of elements in $(A \times B)$ ?

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Solution

$\begin{matrix} N u m b e r o f e l e m e n t s i n A = 3 N u m b e r o f e l e m e n t s i n B = 3 N u m b e r o f e l e m e n t s i n (A \times B) = 3 \times 3 = 9 \end{matrix}$

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