Npr Meaning Math : Npr and ncr are the mathematical notation of two important concepts in mathematics, referred to as permutations and combinations.. In mathematics, npr is the permutation of arrangement of 'r' objects from a set of 'n' objects, into an order or . Wish you all the best in your exam preparation! Npr represents the probability of selecting an ordered set of 'r' objects from a group of 'n' number of objects. The formula to find permutation is:. ( n − r ) ! Visit mathormaths.com for more like this! Understand the npr formula with . Follow me on www.twitter.com/mathormaths, and like www.facebook.com/mathmathsmathematics to stay . Wish you all the best in your exam preparation! Npr & ncr (permutation & combination)with these core concept,. It's read as "n choose r", and it means, given n objects, the number of different ways to choose r of them". The number of permutations of the n objects taken k at