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    xotica's Avatar
    xotica Posts: 6, Reputation: 1
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    #1

    Dec 16, 2008, 08:50 PM
    Dice Probability
    Suppose you roll 4 dice.

    a) What is the probability that you get 4 different numbers?

    b) What is the probability that you get '2 pairs' (two of one number and
    two of another number?)

    c) Now suppose that you continue rolling 4 dice over and over until you get
    either get '4 different numbers' or 'two pairs'. What is the probability
    that you get 'two pairs' first?
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Dec 17, 2008, 06:02 PM
    Dear xotica

    Here is a LINK to a website where you can find all the info you need to answer these questions.

    Success !

    :)
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #3

    Dec 17, 2008, 07:44 PM
    b) What is the probability that you get '2 pairs' (two of one number and
    two of another number?)
    Count them up. Let's pair them.

    1122, 1133,1144,1155,1166,2233,2244,2255,2266,3344,3355, 3366,4455,4466,5566

    Each of these can be arranged in 6 ways.

    (15)(6)=90

    There are total arrangements.
    xotica's Avatar
    xotica Posts: 6, Reputation: 1
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    #4

    Dec 17, 2008, 08:45 PM

    Does anyone know c?
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