A jar contains four white marbles, five red marbles, and six black marbles. If a marble were selected at random, the probability that it is white or black would be .

Question

A jar contains four white marbles, five red marbles, and six black marbles. If a marble were selected at random, the probability that it is white or black would be  .

Quizplus · Accepted Answer

The probability that a marble selected at random is white is 4/15 and the probability that it is black is 6/15. So, the probability of selecting a white or black marble is (4/15) + (6/15) = 10/15, which simplifies to 2/3. Therefore, the statement is true.

A Jar Contains Four White Marbles, Five Red Marbles, and Six