During a survey of a group of 100 consumers 25 had bough a VW, 33 had bough a truck, 15 had bough a Porsche, 20 had bough VW &truck, 6 had bough VW & Porsche, 10 had truck & Porsche, 2 had all 3.
How many consumers had bought none of these vehicles?
n(V’ T’ P’) =
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