Question

Pets, in a pet store, 1/6 of the puppies are black and 1/4 are white. What fraction of the pupplies are black or white?

Answer 1

5/12

Answer 2

\[P(\text{black or white})=P(\text{black})+P(\text{white})-P(\text{black and white})\]
Apparently, a dog can't be black and white (unless you consider a mix of the two, or gray), so we can assume \(P(\text{black and white})=0\).