Multiple Choice Questions on If ratio of number of red balls and white balls is 7 5 then what is the probability of drawing 2 bal........... for SBI(PO) Exam Preparation

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Multiple Choice Questions

If ratio of number of red balls and white balls is 7 5 then what is the probability of drawing 2 bal...........

Quantitative Aptitude (SBI-PO) Probability
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    Direction () : Study the following information carefully and answer the given questions.
    There were some red, some green and some white balls in a bag. Probability of drawing 1 white ball from the bag is 1/3 . If there were 6 more red balls in the bag, the probability of getting 1 green ball would have been1/30  less

    If ratio of number of red balls and white balls is 7 : 5, then what is the probability of drawing 2 balls such that one is red and other is white?

    5/29

    Incorrect Answer

    14/87

    Incorrect Answer

    15/58

    Incorrect Answer

    28/87

    Correct Answer

    None of these

    Incorrect Answer
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    Explanation:

    Let the number of white balls = w, the number of green balls = g and the number of red balls = r, then
    = w/(w+g+r)=1/3
    ⇒ (g + r) = 2w
    ⇒ g = (2w – r)

    According to question

    By: Munesh Kumari
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