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Math Help - Number of ways.

  1. #1
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    Number of ways.

    How many five digit natural numbers, with different digits can be formed from the digits 1 to 9 if each number is to contain three odd digits and two even digits?
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  2. #2
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    There are no new concepts here from the question you posted in

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  3. #3
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    I honestly have no idea how to do this q..
    Can someone give me an idea of how to start it?
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  4. #4
    Senior Member nikhil's Avatar
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    even numbers: 2,4,6,8
    odd numbers : 1,3,5,7,9
    we have to form a number 5 digit number with 3 odd digits and two even digits
    now number of ways in which 3 odd numbers can be taken=5C3
    number of ways in which 2 even numbers can be taken=4C2
    now number of ways of forming the number=5C3*4C2*5!
    because each combination obtained can be written in 5! ways
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