Question 34

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waecmaths question: 

P = {3, 9, 11, 13} and Q = {3, 7, 9, 15} are subsets of the universal set  ξ = {1, 3, 7, 9, 11, 13, 15}. Find $P'\cap Q'$

Option A: 

{3, 9}

Option B: 

{5, 7, 15}

Option C: 

{1}

Option D: 

{1, 11}

waecmaths solution: 

$\begin{align}  & \xi =\{1,3,7,9,11,13,15\} \\ & P=\{3,9,11,13\} \\ & P'=\{1,7,15\} \\ & Q=\{3,7,9,15\} \\ & Q'=\{1,11,13\} \\ & P'\cap Q'=\{1\} \\\end{align}$

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