waecmaths question:
Given that n(P) = 19,$n(P\cup Q)=38$ and $n(P\cap Q)=7$ find n(Q)
Option A:
26
Option B:
31
Option C:
36
Option D:
50
waecmaths solution:
$\begin{align} & n(P\cup Q)=n(P)+n(Q)-n(P\cap Q) \\ & 38=19+n(Q)-7 \\ & n(Q)=26 \\\end{align}$
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