Recent content by ClosedCastle

  1. C

    Permutations Find the values ex. P(n,2)=90

    What do you mean by "and then cancel"?
  2. C

    Permutations Find the values ex. P(n,2)=90

    ok, that didn't go the way I expected,hehe thank you HallsofIvy, now I have to learn how to use LaTeX..
  3. C

    Permutations Find the values ex. P(n,2)=90

    I trie with Latex: [itex]2\frac{n!}{(n-2)! + 50 = \frac{2n!}{(2n-2)!}[itex\]
  4. C

    Permutations Find the values ex. P(n,2)=90

    Ok thanks, I think I understand what you mean, So 1) n(n-1)=90 then n=10 2) n-2 = 3 then n=5 but if I trie to solve this one it doesn't at up: 3) 2P(n,2)+50=P(2n,2) 2((n!/(n-2))!+50)=2n!/(2n-2)! Is this correct?
  5. C

    Permutations Find the values ex. P(n,2)=90

    How can I solve this? Find the value of n.1. P(n,2)=90 ; 2. P(n,3)=3P(n,2) I tried like this but I am stuck 1. n! / (n-2)! = 90 and then I don't know ... 2. n!/(n-3!) = 3 n!/(n-2)! ⇔ n! (n-2)! / (n-3)! n! = 3 ⇔ (n-2)! / (n-3)! = 3 here the same As you can see I'm really stuck with this.