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

    Question

    In a bag, there are 7 red balls, 5 black balls, and 9

    green balls. If two balls are selected at random, what is the likelihood of picking one red ball and one black ball?
    A 1/3 Correct Answer Incorrect Answer
    B 1/6 Correct Answer Incorrect Answer
    C 2/15 Correct Answer Incorrect Answer
    D 1/12 Correct Answer Incorrect Answer
    E 5/24 Correct Answer Incorrect Answer

    Solution

    Total number of balls in the bag = 7 + 5 + 9 = 21 Probability that a red ball and a black ball are drawn = 7C1 × 5C1/21C2 = 7 × 5/210 = 1/6

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