Results 1 to 2 of 2

Math Help - Permutation and combination

  1. #1
    Newbie
    Joined
    Aug 2013
    From
    Mauritius
    Posts
    11
    Thanks
    1

    Permutation and combination

    Calculate the number of different 5-digits numbers which can be founded using the digits 0,1,2,3,4 without repetition and assuming that a number cannot begin with 0.

    How many of these 5-digits numbers are even ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,607
    Thanks
    591

    Re: Permutation and combination

    Hey Matt512.

    Hint: Consider one digit at a time (you want to draw a tree diagram). The first digit has four combinations as does the second (because you can have 0 in the second but not the first). Complete this for the 3rd, 4th, and 5th digit and note that each digit is independent.

    In probabilities and frequencies (or counts) independence means you multiply each digit combination to get total combinations.

    Hint for 2: Remember that even numbers must end in a 0, 2, 4, or 8 (last digit).
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. permutation and combination
    Posted in the New Users Forum
    Replies: 2
    Last Post: October 28th 2012, 06:58 AM
  2. permutation & combination
    Posted in the Statistics Forum
    Replies: 3
    Last Post: February 23rd 2011, 06:10 AM
  3. Permutation and combination help!
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: October 31st 2010, 10:32 PM
  4. Permutation & Combination help.
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: May 27th 2010, 05:22 AM
  5. Permutation and combination
    Posted in the Statistics Forum
    Replies: 2
    Last Post: February 16th 2010, 03:30 AM

Search Tags


/mathhelpforum @mathhelpforum