If a box contains 15 red balls, 12 green balls and 18 blue balls, what is the probability selecting of of green ball in random?

Question: If a box contains 15 red balls, 12 green balls and 18 blue balls, what is the probability selecting of of green ball in random?

Solution:
Total balls in the box = 15 + 12 + 18 = 45
Favourable outcomes (green balls) = 12

Probability of selecting a green ball,
∴ P(green) = Favourable outcomes/Total outcomes
= 12/45
= 4/15 ; [Divided by 3]

So, the probability of selecting a green ball at random is 4/15.