It is just as Travis stated. where n>r now,what does nCr means and why we are using it ?what is need of it? Four people are interested in playing.

mathematically,nCr=n!/(n-r)!.r! Looking for online definition of NCR or what NCR stands for? Their names are a, b, c and d. How many different teams are possible? NCR is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms The Free Dictionary Here is an example: There is a 3 on 3 basketball tournament, you want to create a team of 3 people. Home; Math; Probability & Statistics; Permutation (nPr) and Combination (nCr) calculator uses total number of objects `n` and sample size `r`, `r\leq n`, and calculates permutations or combinations of a number of objects `r`, are taken from a given set `n`.