$μ$ = {a, b, c, d, e, f, g, h, i, j}
P = {a, b, c, e}.
Q = {b, c, d, f} and
R = {c, f, h, i, j}
Number of elements of the set $(P \cap Q)^{'} \cup R$ is:

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Solution

$P \cap Q = {b, c}$
$(P \cap Q)^{'} = {a, d, e, f, g, h, i, j}$
$(P \cap Q)^{'} \cup R = {a, c, d, e, f, g, h, i, j}$
$\Rightarrow n ((P \cap Q)^{'} \cup R) = 9$

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