A box is filled with 11 brown cards, 5 green cards, and 4 blue cards.

Question

A box is filled with 11 brown cards, 5 green cards, and 4 blue cards. A card is chosen at random from the box. What is the probability that the card is not green?

Answer 1

total of 20 cards; 5 are green, so 15 are non-green.

P(non-green) = 15/20 = 3/4.