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Math Help - Quick stat/factoral questions? Possible explanation?

  1. #1
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    Quick stat/factoral questions? Possible explanation?

    how many possible 5 digit zip codes are there if numbers can't be repeated?

    how many ways can 7 different items be arranged in a single line? (is that 7 factorial?)

    how many ways can i select 5 different objects out of 12 objects total?
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  2. #2
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    Quote Originally Posted by thecleric View Post
    how many possible 5 digit zip codes are there if numbers can't be repeated? Mr F says: (10)(9)(8)(7)(6) = ...... if a zip code can start with 0, (9)(9)(8)(7)(6) = ...... otherwise.

    how many ways can 7 different items be arranged in a single line? (is that 7 factorial?) Mr F says: Yes.

    how many ways can i select 5 different objects out of 12 objects total? Mr F says: {\color{red} {12 \choose 5}}
    ..
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    yeah zip codes are example of permutations...wikipedia solved that one for me. about third one...

    bad wording,

    how about:
    if you have 12 flowers, how many different ways can you select 5 of them for display
    Last edited by thecleric; March 5th 2009 at 03:49 AM. Reason: mistype
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  4. #4
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    Quote Originally Posted by thecleric View Post
    yeah zip codes are example of permutations...wikipedia solved that one for me. About third one...

    Bad wording,

    how about:
    If you have 12 flowers, how many different ways can you select 5 of them for display
    ^{12}\text{P}_5
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  5. #5
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    lol sorry, but 12 to the power of 5? or 5 to the power of 12?
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  6. #6
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    Quote Originally Posted by thecleric View Post
    lol sorry, but 12 to the power of 5? or 5 to the power of 12?
    Read section 2: Permutation - Wikipedia, the free encyclopedia

    I had thought the notation would be familiar ....
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  7. #7
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    oops didn't see the older notation part...thanks
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