Multiple choice

Study the following information carefully to answer the question that follow. A box contains 2 blue balls, 5 green, 4 red and 1 yellow balls. If two balls are picked at random, what is the probability that both are blue?

  1. 7/66

  2. 3/132

  3. 1/66

  4. 5/67

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total balls = 2 + 5 + 4 + 1 = 12. Number of blue balls = 2. Probability of first ball being blue = 2/12. After removing one blue ball, probability of second ball being blue = 1/11. Combined probability = (2/12) × (1/11) = 2/132 = 1/66.

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