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Math Help - Stuck on simple probability question. Need help please

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    Stuck on simple probability question. Need help please

    hi guys i have some homework and im struggling to work out how to do some of these problems:

    1) If you flip a coin 3 times. Whats the probability of getting the order: Heads, tails, heads?
    Last edited by jeffmama11112; October 18th 2012 at 07:07 AM.
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    Re: Stuck on simple probability question. Need help please

    Quote Originally Posted by jeffmama11112 View Post
    hi guys i have some homework and im struggling to work out how to do some of these problems:

    1) If you flip a coin 3 times. Whats the probability of getting the order: Heads, tails, heads?
    how about first writing down the possible outcomes when you flip a coin 3 times?

    Hint: when you toss a coin, you have two possible outcomes: H or T. If you toss a coin three times, the tree tosses are independent of each other. So there are 2*2*2=8 outcomes. Write them down
    Last edited by harish21; October 18th 2012 at 07:14 AM.
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    Re: Stuck on simple probability question. Need help please

    Thanks harish here are the outcomes (8 OF THEM):
    HHH
    HHT
    HTH
    THH
    HTT
    THT
    TTH
    TTT
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    MHF Contributor harish21's Avatar
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    Re: Stuck on simple probability question. Need help please

    Quote Originally Posted by jeffmama11112 View Post
    Thanks harish here are the outcomes (8 OF THEM):
    HHH
    HHT
    HTH
    THH
    HTT
    THT
    TTH
    TTT
    so out of 8 possible outcomes, you have one outcome that has the order HTH. so you probability is...
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    Re: Stuck on simple probability question. Need help please

    1/8 lol i feel dumb for not knowing that haha. Thanks man
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    Re: Stuck on simple probability question. Need help please

    Another way of doing it: The probability of getting Heads on the first flip is 1/2. The probability of getting Tails on the first flip is 1/2. The probability of tails on the third flip is 1/2. The probability of getting those results on exactly that order is (1/2)(1/2)(1/2).
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    Re: Stuck on simple probability question. Need help please

    Thanks HallsofIv yeh thats another good way of putting it
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