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    paul.9727593863's Avatar
    paul.9727593863 Posts: 1, Reputation: 1
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    #1

    Nov 8, 2010, 08:43 AM
    Suppose you roll a single die.
    Suppose you roll a single die.
    a.What is the probability that the number on the face is a 3 or a 6?
    b.What is the probability that the number on the face is not a 2?
    c.What is the probability that the number on the face is a 2 or a 4 or a 6?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 8, 2010, 10:04 AM

    The probability of an event A is given by the number of outcomes of A divided by the total number of outcomes.

    If you want to find the probability of getting a head from tossing a fair coin, there is 1 head and two possibilities, head and tail. Probability of getting a head is therefore 1/2.

    If you want to find the probability of getting a heart from drawing a card from a standard deck of cards, there is 13 hearts and 52 total cards. Probability of getting a heart is therefore 13/52 = 1/4

    Now, the probability of getting something AND something else means you multiply the probabilities.

    e.g.. Getting a head AND a heart = 1/2 x 13/52 = 1/8

    Probability of getting something OR some other thing means you add the probabilities.

    e.g.. Getting a head OR a heart = 1/2 + 13/52 = 3/4.


    Now, try this with your problem and post what you get! :)

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