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Math Help - Ascending order arrangements

  1. #1
    Junior Member
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    Question Ascending order arrangements

    How many four digit numbers can be formed from the digits from 1 to 9 inclusive, if repetitions are not allowed?
    i. How many of these are divisible by 5?
    ii. How many are divisible by 2?
    iii. How many of these contain digits in ascending order eg 1459?

    I've done i and ii and i got 336 and 1344 but I'm confused about how to do part iii.
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  2. #2
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    Nevermind I think i got it, 126.
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  3. #3
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    oh dear.....somehow i have edited my post away when i thought i was posting a reply.

    Glad it worked though
    Last edited by SpringFan25; May 29th 2010 at 07:16 PM.
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