How to perform calculations on combinations?

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C#3.0

C#

Windows

Hi all,

I need to find combinations, and calculate values for the resultant combinations by substituting values..

string[] str=new string[]{"A","B","C","D"};
double[] vals=new double[]{1,3,6,9};

A=1;
B=3;
C=6;
D=9

Say N=4,M=3;// N and M are Dynamic values
N-M+1=2;

so i want to find combinations for str with N-M+1 Value ie 4C2 = 6.
i am getting 6 Combinations.
AB
AC
AD
BC
BD
CD..

finally i want to calculate & store the combination values in another Array..

I used below code, it works for N=4,M=2

for (int j = 0; j < factval; j++)//factval,faval is FactorialValue ie 4C3 Combination Value
{
   for (int k = 0; k < PFDdu.Length; k++)//PFDdu is str Length
   {
       if (!string.IsNullOrEmpty(PFDdu[(k + 1) % PFDdu.Length].ToString()))
       {
          if (j != (k + 1) % PFDdu.Length)
          {
              faval[j] = faval[j] * PFDdu[(k + 1) % PFDdu.Length];
          }
       }
   }
}

Can any body help me on this plz..

with Regards,
Pawan.