You can check the result with our nCr calculator. If we have n things of which x number of things are of same kind y number of things are of same type and similarly z number of things are of the same. How many different committees of 4 students can be chosen from a group of 15.
N is the size of the set from which elements are permuted.
List or generate all possible combinations from two lists with formula. I dont think this formula for counting is correct. Is the factorial operator. The word has followed by a space and a number.