The number of permutations of n objects taken r at a time is determined by the following formula. The symbol can either be read n choose r or n taken r at a time which are from its probability applications. NCr is the number of combinations function or binomial coefficient defined as a nCr b a b a-b where a and b are nonnegative integers.
The Combination Calculator nCr tool enables you to calculate the factorial of a chosen number.
The calculator will find the binomial expansion of the given expression with steps shown. I want to choose 2 out of them. In maths nCr is used to find out the number of ways to choose r objects subset from n number of objects larger set. NPr Permutation Combination nCr Formulas This simple tool gives you the Level by Level calculation to find number of different nCr combinations and permutations nPr.