math

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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.

  • math -

    A: 80/100
    B: 65/100
    C: 15/100
    D: 25/100

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