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

    Question

    A glass jar contains 6 white, 8 black, 4 red and 3 blue

    marbles. If a single marble is chosen at random from the jar, what is the probability that it is black or blue?
    A 8/21 Correct Answer Incorrect Answer
    B 11/21 Correct Answer Incorrect Answer
    C 5/21 Correct Answer Incorrect Answer
    D 1/7 Correct Answer Incorrect Answer

    Solution

    Total number of marbels in the jar = 6 + 8 + 4 + 3 = 21 probability that it is black or blue = 1 - 10/21 = 11/21

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