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An urncontains 5 red and 2 black balls. Two balls are randomly selected. Let x represent the number of black balls. What are the possible valuesof X ? Is X a random variable ?

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Knowledge Check

  • A bag contains 5 red and 3 blue balls. If 3 balls are drawn at random without replacement the probability of getting exactly one red ball is

    A
    45/196
    B
    135/392
    C
    15/56
    D
    15/29

  • A bag contaings 3 white 4 black 2 red balls if 2 balls are drawn at random then the probability that both the balls are white is

    A
    `1/18`
    B
    `1/36`
    C
    `1/12`
    D
    `1/24`

  • A bag contains 3 white , 4 black , 2 red balls . If 2 balls are drawn at random , then the probability that both the balls are white is :

    A
    `1/18`
    B
    `1/36`
    C
    `1/12`
    D
    `1/24`

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