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 $\frac { 2 } { 3 }$.

Question

Quizplus · Accepted Answer

The total number of marbles is 15 (4 white + 5 red + 6 black). The probability of selecting a white or black marble is the sum of their individual probabilities, which is $\frac{4}{15} + \frac{6}{15} = \frac{10}{15} = \frac{2}{3}$.

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