New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A bag contains 6 balls of which 3 are red and 3 are

    black. They are drawn successively without replacement. What is the probability that colors are alternate?
    A 1/10 Correct Answer Incorrect Answer
    B 1/20 Correct Answer Incorrect Answer
    C 1/5 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    We can choose balls as black, red or red black alternately, Required probability = 2 × (3/6 × 3/5 × 2/4 × 2/3 × 1/2 × 1) = 1/10

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