Cameroon GCE O-Level Mathematics

Practice session

If universal set $\mathcal{E} = \{x : x \in \mathbb{Z}^+, 1 \le x \le 10\}$, set $A = \{2, 3, 5, 7\}$, and set $B = \{1, 3, 5, 7, 9\}$, find $n(A \cap B)$.

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