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Math Help - Permutation (Basic)

  1. #1
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    Permutation (Basic)

    I just able to answer 1 of 2 question. please find attached file regarding my calculation regarding the second part of the question.

    the correct ans from the book is 30.
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  2. #2
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    Re: Permutation (Basic)

    Quote Originally Posted by nikconsult View Post
    I just able to answer 1 of 2 question. please find attached file regarding my calculation regarding the second part of the question.

    the correct ans from the book is 30.
    Those numbers must begin with either a 3 or 4 and end with an odd digit.

    So you must consider two cases:
    1) numbers that begin with a 3 and end with 5 or 7.
    2) numbers that begin with a 4 and end with 3, 5 or 7.

    Add those together.
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  3. #3
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    Re: Permutation (Basic)

    thank you mr ploto.. i try to solve it. why should we separate it into 2 case here & add??
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