Results 1 to 3 of 3

Math Help - Permutation

  1. #1
    Newbie
    Joined
    Apr 2013
    From
    Hong Kong
    Posts
    11

    Permutation

    Hi I really need help with the following questions. Thanks


    1. (a) How many different numbers of 4 digits may be formed with the digits 0,1,2,5,6,7,8 if no digit is used more than once in any number?


    (b) How many of the numbers formed in (a) are even?


    2. There are 6! Permutations of the 6 letters of the word "square"
    (a) In how many of them is "r" the second letter? _ r _ _ _ _
    (b) In how many of them are "q" and "e" next to each other?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    4,169
    Thanks
    765

    Re: Permutation

    Hey strangepath.

    Try looking into the multivariate hypergeometric distribution for a route to calculating an exact probability (and hence frequency).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jul 2012
    From
    INDIA
    Posts
    834
    Thanks
    209

    Re: Permutation

    For the first one i would go like this:
    any one of the six numbers ( 1,2,5,6,7,8 ) can assume thta place.
    Thus the first place can be filled in = 6 ways
    Second place can be filled in = 6 ways , Because second place can be occupied by 0.
    Third place can be filled in = 5 ways
    and fourth place can be filled in = 4 ways
    Thus total number of ways = 6x6x5x4
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Is this a permutation?
    Posted in the Discrete Math Forum
    Replies: 1
    Last Post: October 12th 2010, 01:40 PM
  2. permutation
    Posted in the Discrete Math Forum
    Replies: 26
    Last Post: June 24th 2010, 09:40 AM
  3. Permutation-1
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 18th 2010, 06:04 AM
  4. Permutation
    Posted in the Discrete Math Forum
    Replies: 6
    Last Post: January 17th 2010, 05:17 PM
  5. Permutation
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: August 7th 2008, 12:01 PM

Search Tags


/mathhelpforum @mathhelpforum