Instructions

Study the given information carefully and answer the question that follow:
A basket contains 4 red, 5 blue and 3 green marbles

Question 117

If two marbles are picked at random what is the probability that both are red ?

Solution

The total number of ways of picking two marbles is $$^{12}C_2 = 66$$

The total number of ways of picking two red marbles is $$^4C_2 = 6$$

Hence, the required probability is $$\frac{6}{66} = \frac{1}{11}$$

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