All you need to do for your part is simply input the total number n of elements in the given set and total number r of the elements you want your combinations in. Select 3 nCr and press ENTER Step 4. The permutations formula is P nr n.
This simple tool gives you the Level by Level calculation to find number of different nCr combinations and permutations nPr.
However the order of the subset matters. N - r. N int nval. Nval input Enter value of n.