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Math challenge!

a class adviser surveys 35 students on the kind of pets they have at home.he found that 15 have dogs,12 have cats,and 8 have mice.five have dogs and cats,4 have dogs and mice,and 2 have cats and mice.if no one has all three kinds of pets,how many student have none of these pets?


There are 9 students that have no pets like mice,dogs and cats
0 0 0
11 students have none of these pets
0 0 0
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