Results 1 to 2 of 2

Math Help - Permutations HELP!

  1. #1
    Junior Member
    Joined
    Nov 2008
    Posts
    53

    Permutations HELP!

    Hi, I am currently learning Grade 12 Data Management online and I have come across a few questions that I am stuck on.

    They are:

    Solve for n where:

    a) n! divided by (n - 2)! = 930 (4 marks)

    b) P(n,5) = 42 x P (n, 3) (5 marks)

    21. a) From the word parallel ...
    a) How many arrangements can be formed from all the letters in the word parallel?
    My answer:
    8! divided by 3! 2! = 3360 (because there are 8 letters total, divided by 3 of the same letter 'L' and 2 of the same letter 'A')

    b) In how many of these arrangements will the 3 "l's" be together?

    If someone could help me that would be greatly appreciated!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,616
    Thanks
    1578
    Awards
    1
    Quote Originally Posted by cnmath16 View Post
    Solve for n where:
    a) n! divided by (n - 2)! = 930 (4 marks)
    b) P(n,5) = 42 x P (n, 3) (5 marks)
    21. a) From the word parallel ...
    a) How many arrangements can be formed from all the letters in the word parallel?
    My answer:
    8! divided by 3! 2! = 3360 (because there are 8 letters total, divided by 3 of the same letter 'L' and 2 of the same letter 'A') CORRECT

    b) In how many of these arrangements will the 3 "l's" be together?
    \frac {n!}{(n-2)!}=n(n-1)

    P(n,k)=\frac{n!}{(n-k)!}

    21.b. \frac{6!}{2!}. WHY?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Permutations
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: December 13th 2009, 05:10 AM
  2. Permutations
    Posted in the Discrete Math Forum
    Replies: 9
    Last Post: November 26th 2009, 09:55 PM
  3. Permutations
    Posted in the Discrete Math Forum
    Replies: 4
    Last Post: October 28th 2009, 02:27 PM
  4. permutations
    Posted in the Number Theory Forum
    Replies: 2
    Last Post: May 18th 2009, 01:38 AM
  5. Permutations
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: October 16th 2008, 06:59 PM

Search Tags


/mathhelpforum @mathhelpforum