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According to a survey conducted by the National Pizza Foundation that I just now made up, out of 109 customers surveyed, 32 prefer pizzas with just pepperoni, 40 with just sausage, and 18 with only onions. Thirteen big-time carnivores like pepperoni and sausage, 10 customers prefer sausage and onions, 9 customers like pepperoni and onions; in each case, the third item could be included as well. Seven go all out, ordering all three.
- (a) How many customers prefer pepperoni, or sausage, or pepperoni and sausage with no onions?
- (b) What about sausage, or onions, or sausage and onions with no pepperoni?
- (c) How many go the boring route—none of those toppings?
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