Question

A survey was given to 281 people asking whether people like dogs and/or cats.

115 said they like dogs
180 said they like cats
41 said they don't like cats or dogs.

How many said they liked both cats and dogs?

Answer 1

55

Explanation:

P(A or B) = P(A) + P(B) − P(A and B)

281 − 41 = 115 + 180 − P(A and B)

P(A and B) = 55