Given,
A box containing 5 red, 8 white and 4 green marbles.
So, the total no. of possible outcomes = 17 (5 red + 8 white + 4 green)
(i) Let E = Event of getting a red marble
Number of favourable outcomes = 5 (as 5 red marbles)
Probability, P(E) = Number of favourable outcomes/ Total number of outcomes
P(E) = 5/17
(ii) Let E= event of getting a green marble
Number of favourable outcomes = 4 (as 4 green marbles)
Probability, P(E) = Number of favourable outcomes/ Total number of outcomes
P(E) = 4/17
So,
¯
E
= Event of getting not a green marble
Then we know that,
Therefore, the probability that the marble taken out is not green is 13/17.