Posted by **terry** on Saturday, March 13, 2010 at 1:33pm.

in a group of 100 people, 40 own a cat, 25 own a dog and 15 own a cat and a dog. Find the probability that a person chosen at random

a) owns a dog or a cat

b) owns a dog or a cat, but not both

c)owns a dog, given that he owns a cat

d) does not own a cat, given that he owns a dog.

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