A bag contains 5 red marbles, 8 white marbles, 4 green marbles. What is the probability that if one marble is taken out of the bag at random, it will be
(i) red
(ii)  white
(iii)  not green

Explanation

Number of red marbles`=5`
Number of white marbles` =8`
Number of green marbles `=4`
Total number of marbles `=5+8+4=17`
∴ The total number of cases `=17`
P(getting white marble)`=8/17`
Since there are `4` green marbles, the number of favourable outcomes is `4`.
P(a green marble) `=4/17`
P(not a green marble) `=1-4/17=13/17`