N-factorial gives the number of permutations of n items. Number of combinations when there are total n elements and r elements need to be selected. Use your finger stylus or mouse to write your equation.
One might define an anagram of a word as a permutation of its letters.
The number of permutations of n distinct objects is. I am typing mathematics. Insert a formula in a table cell Select the table cell where you want your result. A program that calculates combination and permutation in C is given as follows.