P = {3, 9, 11, 13} and Q = {3, 7, 9, 15} are subset of the universal set ξ = {1, 3, 7, 9, 11, 13, 15} find PI ∩ QI

P = {3, 9, 11, 13} and Q = {3, 7, 9, 15} are subset of the universal set ξ = {1, 3, 7, 9, 11, 13, 15} find P^I ∩ Q^I

A {3, 9}
B {5, 7, 9}
C {1}
D {1, 11}

waec 2005 mathematics

The correct answer is C. {1}

P^I = {1, 7, 15} ; Q^I = {1, 13, 11}

P^I â© Q^I = {1}

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