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.
Question 77
If three marbles are drawn at random, what is the probability that at least one is yellow?
Solution
At least one marble is yellow which means that there can be one yellow marble or two yellow marbles or three yellow marbles.
We know that 0 < probability < 1.
Subtractiong the probability of having no yellow marble gives the probability of having at least on yellow marble.
1 - (11C3/14C3) = 1 - $$\frac{165}{364}$$ = $$\frac{199}{364}$$
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