Question

A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will not be a white marble?
(a) $\frac{1}{3}$ (b) $\frac{4}{9}$ (c) $\frac{7}{9}$ (d) $\frac{2}{9}$

Answer 1

total no. of marbles = 9
the probability of selecting a white marble = 2/9
the probability of not selecting a white marble = 1-2/9 = 7/9