Question

A box contains $7$ red marbles, $10$ white marbles and $5$ green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be
(i) not red? (ii) white? (iii) green?

Answer 1

Number of red marbles $=7$

Number of white marbles $=10$

Number of green marbles $=5$

Total marbles $=7+10+5=22$

Probability of getting not red marble $=\frac{15}{22}$

Probability of getting white marble $=\frac{10}{22}$

Probability of getting green marble $=\frac{5}{22}$