Mike, The series P(n) = {1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440} is Catalan numbers. Can you please throw more light on how you arrrived at this solution.
TIA Gautham On 7/19/07, Mike <[EMAIL PROTECTED]> wrote: > > > Hi Rupesh, > > Despite the fact that the answer may not help you, my colleagues and I > worked on this problem today. The closed-form solution for two lists > of size n is as follows: > > The number of possible permutations, following your original > instructions, are: > > P(n) = (2*n)! / (n!)^2 - (2*n)! / [(n-2)!*(n+2)!] = (2*n)nCr(n) - > (2*n)nCr(n-2) > > In practice, this number gets very large very quickly. For example, > the result for n={1,2,...14} is > P(n) = {1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, > 742900, 2674440} > > The reasons for this are complicated, but contact me if you're > interested and I'd be glad to elaborate. > > Mike > > > > On Jul 17, 11:04 pm, "Rupesh Bhochhi" <[EMAIL PROTECTED]> wrote: > > Thank you Karthik for your effort. I figure out lately that My > > question is not that much logical. Actually there will be only one > > possible combination that we can easily get as we have already got the > > sorted lists. > > > > On 7/17/07, Karthik Singaram L <[EMAIL PROTECTED]> wrote: > > > > > > > > > Hi, > > > Although, I cannot give you a complete solution right now..I will > give you > > > the following relations (I am not sure If they are > correct.....discussions > > > welcome) > > > > > T(0, x) = 1 > > > T(x, 0) = 1 > > > T(1, x) = (x+1) > > > T(x, 1) = (x+1) > > > T(n, m) = Sum[i=0..n] { T(n-i, m-2) * (i+1) } > > > > > If you are looking for a program, then you can code this up...If you > are > > > looking for a closed form solution, this needs to be tidied up. > > > > -- > > Rupesh Bhochhibhoya, [EMAIL PROTECTED] > > Oklahoma State University > > Stillwater, OK 74075 > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algogeeks@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/algogeeks -~----------~----~----~----~------~----~------~--~---