Instructions
Instructions: Study the given information carefully to answer the questions that follows.
An urn contains 4 green, 5 blue, 2 red and 3 yellow marbles.
An urn contains 4 green, 5 blue, 2 red and 3 yellow marbles.
Solution
Out of the fourteen marbles four are green in colour
Subtracting the green marbles from the total marbles we will be left with 10 marbles
Out of ten marbles three can be choosen in 10C3 ways
Probability of not choosing a choosing marble = 10C3/14C3 = $$\frac{30}{91}$$
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