Subject

    Quantitative Aptitude

    Topic

    Probability

    A bag contains 3 red balls, 5 yellow balls and 7 pink balls. If one ball is drawn at random from the bag, what is the probability that it is either pink or red?

    ক)
    2/3
    খ)
    1/8
    গ)
    3/8
    ঘ)
    3/4

    Explanation

    Given number of balls = 3 + 5 + 7 = 15 One ball is drawn randomly = 15C1 probability that it is either pink or red = 7C1  +  3C115C1  =  7  +  315  =  1015  =  23\frac{7{\mathrm C}_1\;+\;3{\mathrm C}_1}{15{\mathrm C}_1}\;=\;\frac{7\;+\;3}{15}\;=\;\frac{10}{15}\;=\;\frac23

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