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WAEC - Mathematics (1991 - No. 31)

P = {2, 1,3, 9, 1/2}; Q = {1,21/2,3, 7} and R = {5, 4, 21/2}. Find P∩Q∩R
(21/2)
∅
(1, 3, 7)
(4)
(5,7,9)

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