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

    Question

    A bag contains 3 white balls , 5 blue balls ,

    and 8 red balls . One ball is picked randomly from the bag and discarded. What is the probability of selecting a red ball from the remaining balls?
    A 2/3 Correct Answer Incorrect Answer
    B 7/16 Correct Answer Incorrect Answer
    C 5/32 Correct Answer Incorrect Answer
    D 4/9 Correct Answer Incorrect Answer
    E 1/2 Correct Answer Incorrect Answer

    Solution

    Required probability: = Probability of drawing (White in first, Red in second) + Probability of drawing (Blue in first, Red in second) + Probability of drawing (Red in first, Red in second) = (3/16) X (8/15) + (5/16) X (8/15) + (8/16) X (7/15) = (24/240) + (40/240) + (56/240) = (120/240) = (1/2)

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