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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