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WAEC - Mathematics (1998 - No. 58)

If P = {3, 7, 11, 13} and Q = {2, 4, 8, 16}, which of the following is correct
\((P\cap Q)^l={2, 3, 4, 13}\)
\(n(P\cup Q)=4\)
\(P\cup Q = \emptyset\)
\(P\cap Q = \emptyset\)

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