Question

    What is the probability of getting two white balls from

    a box containing only white and blue balls? Statement I : There are total 72 balls in the box. Statement II : The probability of the first ball being white is 1/12. Directions(Q.71 -75) : In each of the following questions, a question and two statements I and II are given. You have to decide whether the date given in the statements are sufficient to answer the question or not.
    A If the data in statement I alone is sufficient to answer the question. Correct Answer Incorrect Answer
    B If the data in statement II alone is sufficient to answer the question. Correct Answer Incorrect Answer
    C If the data either in statement I alone or statement II alone are sufficient to answer the question. Correct Answer Incorrect Answer
    D If the data given in both I and II together are not sufficient to answer the question. Correct Answer Incorrect Answer
    E If the data in both the statements I and II together are necessary to answer the question. Correct Answer Incorrect Answer

    Solution

    From statement II : Probability of second ball being white cannot be known. If we use both statements: Since total 72 balls are there and probability of first being white is 1/12, it can happen only when there are 12 white balls in the box to make the first probability as 12/72 = 1/6. So we can know that probability of second ball being white is 1/5. And then the probability can be found.

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