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A basket contains 4 red, 5 blue and 3 green marbles. If two marbles are drawn at random, what is the probability that both are red?


A) 3 / 7

B) 1 / 2

C) 2 / 11

D) None of these

Correct Answer:
D) None of these

Description for Correct answer:
Total number of possible outcomes
= n(S) = \( 12C_2 = \frac{12 X 11 }{2} = 66 \)

Total number of favourable events

= n(E) = \( 4C_2 \)

=\( \large\frac{4 \times 3}{2 \times 1} = 6 \)

Required probability = \( \large\frac{6}{66} = \frac{1}{11} \)

Part of solved Probability questions and answers : >> Aptitude >> Probability




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