A jar holds 5 red, 9 white and 6 green marbles. If one marble is taken out at random, find the chance that its colour is something other than white.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → \(\frac{11}{20}\)
A marble that is not white is one of the other colours, so the favourable marbles are the red and green marbles together.
Total marbles \(=5+9+6=20\)
Marbles that are not white \(=5+6=11\)
Probability \(\displaystyle =\frac{11}{20}\)