A veterinarian surveys 26 of his patrons. He discovers that 14 have dogs, 10 have cats, and 5 have fish. Four have dogs and cats, 3 have dogs and fish, and one has a cat and fish. If no one has all three kinds of pets, how many patrons have none of these pets?
In a class, 8 students out of 28 have a dog as their pet animal at home ,6 students have a cat as their pet animal .10 students have a dog and cat both, then how many students do not have a dog or cat as their pet animal at home?