nPr can be written as P (n, r) (or)nPr(or)nPr. It is used to find the number of ways of selecting and arranging r different things from n different things.nPr formulais also known aspermutations formula(as we call a way of choosing and arranging things to be a permutation). This ...
In mathematics, the product of all positive integers less than or equal to n (i.e) n! = n x (n-1) x (n-2) x ... x 1. The value of 0! = 1. The factorial function is extensively used in permutaions (nPr) & combinations (nCr), probability & statistics, calculus, algebra...
nCr = n! / ((n – r)! r!) n = the number of items. r = how many items are taken at a time. The ! symbol is afactorial, which is a number multiplied by all of the numbers before it. For example, 4! = 4 x 3 x 2 x 1 = 24 and 3! = 3 x 2 x 1 = 6. So...
polymers Article Modification of Alkali Lignin with Poly(Ethylene Glycol) Diglycidyl Ether to Be Used as a Thickener in Bio-Lubricant Formulations Esperanza Cortés-Triviño ID , Concepción Valencia, Miguel A. Delgado and José M. Franco * ID Pro2TecS-Chemical Product and Process Technology ...