Results 1 to 5 of 5

Thread: How many ways can you arrange the word "ARRANGE"

  1. #1
    Junior Member
    Join Date
    Jul 2007
    Answers
    14

    How many ways can you arrange the word "ARRANGE"

    How many ways can you arrange the word "ARRANGE". But the condition is the two R's do not come together..


  2. #2
    Expert Member
    Join Date
    Jun 2006
    Answers
    410

    Re: How many ways can you arrange the word "ARRANGE"

    Ans is 1,800 diff ways.

    7!/2! - 6! = 1800


  3. #3
    Contributing Member
    Join Date
    Sep 2006
    Answers
    962

    Re: How many ways can you arrange the word "ARRANGE"

    Hi James,

    Can you please explain which formula you have been used..I am confused. I know only one formula:
    Find all of the differennt ways to arrange "r" items out of "n" items.
    Name:  combination-formula.gif
Views: 351
Size:  1.5 KB

    ----------------------
    suresh


  4. #4
    Expert Member
    Join Date
    Jun 2006
    Answers
    410

    Re: How many ways can you arrange the word "ARRANGE"

    In this case we need to arrange the letters with the condition that two R's do not come together.

    It is easy to find the number of words the two R's come together.

    Let us find the total number of different words that can be formed with the letters in "ARRANGE". then it is easy find number of words two R's do not come together.

    The word "ARRANGE" has two repeated elements A(twice) and R(twice). The formula for permutations with repeated elements is as follows,
    When k out of n elements are indistinguishable, e.g. k copies of the same book, the number of different permutations is n!/k!.

    Therefore the total number of different words that can be formed is 7!/2! *2!

    To find the number of words the two R's come together let us consider the pair RR as one single element and now we have six elements with one repeated element "A".

    Therefore the total number of different words with two R's come together is 6!/2!

    Hence number of words that two R's don't come together is
    7!/2! *2! - 6!/2! = 1260 -360 = 900

    Actually I was wrong in my previous post. I did not notice that the word has two A's.


  5. #5
    Junior Member
    Join Date
    Jul 2007
    Answers
    14

    Re: How many ways can you arrange the word "ARRANGE"

    ok thanks james...
    now i'm also cleared about that doubt..
    i thought suresh also now cleared..
    thanks a lot..


  6.  Sponsored Ads
    Ad


     

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Applying for a job can be a stressful and frustrating experience, especially for someone who has never done it before. Considering that you are competing for the position with a at least a dozen other applicants, it is imperative that you thoroughly prepare for the job interview, in order to stand a good chance of getting hired. That's where GeekInterview can help.
Interact