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Math Help - Dividing objects in to groups.

  1. #1
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    Dividing objects in to groups.

    Hi,

    I hope I've put this in the right area. It's been a long time since I've been in school

    What I'd to know is the formula for how to solve a problem like:

    There are 30 unique hats/cars/whatever and you have to select 4. How many unique combinations of 4 hats/cars/whatever is there?

    I don't need an answer for this specific question, just a poke in the right direction.

    Thank you, this seems like a wonderful resource.
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  2. #2
    MHF Contributor harish21's Avatar
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    Without repitition, it would be:

     30C4 = \dbinom{30}{4} = \dfrac{30!}{4! \times (30-4)!}
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