Question 34

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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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