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Math Help - Counting Problem

  1. #1
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    Counting Problem

    Hello everyone. Can someone please point me in the right direction on how to solve the following problem:

    How many different 3 letter initials are there that have at least an A in it?

    Thanks.
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  2. #2
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    Re: Counting Problem

    Quote Originally Posted by troe View Post
    Hello everyone. Can someone please point me in the right direction on how to solve the following problem:
    How many different 3 letter initials are there that have at least an A in it?
    How many total 3 letter initials are there possible?

    How man 3 letter initials contain no A are there possible?

    Now subtract.
    Last edited by Plato; October 27th 2013 at 02:25 PM.
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  3. #3
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    Re: Counting Problem

    How do I find how many 3 letter initials that contains A? Would it be easier to find how many 3 letter initials that don't contain an A and subtract that number from the total possibilities?
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  4. #4
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    Re: Counting Problem

    Quote Originally Posted by troe View Post
    Would it be easier to find how many 3 letter initials that don't contain an A and subtract that number from the total possibilities?
    Did you read reply#2? That is exactly what it says.
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  5. #5
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    Re: Counting Problem

    Thanks.
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