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Math Help - [SOLVED] Combination/probability help please

  1. #1
    sabanknight
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    [SOLVED] Combination/probability help please

    ! need a refresher on this I cant find my notes and my profestor is no where to be found any help is apreciated ^ ^

    1)if you are recieving 8 books as gifts and there are 27 different titles how many possible selections are there if each title can only be used once?:
    the way I remember it you should set it up like this if g=gift
    g27
    g26
    g25
    g24
    g23
    g22
    g21
    g20
    only thing is do I multiply those or add or what? also if anyone knows how it would be entered on a TI-83 plus that would help as well

    2)If a fair die is rolled what is the probability that the number rolled is 5 given that it is odd
    P= favorable/total outcoms p=1/6 also does the given it is odd part have any effect on the problem or is it extra info?

    3)resteraunt offers 3 types of lettuce 5 toppings and 6 dressings in a salad how many combinations are there asuming only one toping letucce and dressing can be chosen
    S T5 D6 6x5=30 30x3=90 ans=90
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  2. #2
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    Quote Originally Posted by sabanknight View Post
    1)if you are recieving 8 books as gifts and there are 27 different titles how many possible selections are there if each title can only be used once?:

    2)If a fair die is rolled what is the probability that the number rolled is 5 given that it is odd

    3)restaurant offers 3 types of lettuce 5 toppings and 6 dressings in a salad how many combinations are there assuming only one toping lettuce and dressing can be chosen
    For #1 why does the order in which you receive the books matter?
    It seems to me that only the content of the gift matters. So it is a combination.
    {{27} \choose {8}}.

    For #2, there are just three odd numbers.

    For #3 You multiply: (3)(5)(6).
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