A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be (i) red?

Total number of marbles in the box = 5 + 8 + 4 = 17
i) P(red) = no. of red marbles / total number of marbles
P(red) = 5/17
ii) P(white) = no. of white marbles / total number of marbles
P(white) = 8/17
iii) P(green) = no. of green marbles / total number of marbles
P(green) = 4/17
P(not green) = 1 - P(green) = 1 - 4/17 = 13/17