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Every student who appled for admission to a vet- erinary school has at least one pet: 30 have a cat, 28 have a dog and

Every student who appled for admission to a vet-

erinary school has at least one pet: 30 have a cat,

28 have a dog and 26 have fish.

If 13 students

have fish and a cat, 15 students have fish and a

dog, and 4

students have a cat, a dog, and fish.

How many

students applied to veterinary school?

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