What is an easy way to remember the difference between nCr and nPr?
nCr is the combination while nPr is the permutation. The easy way to remember the difference between nCr and nPr is their formula. The formula for the combination is n!/r! (n - r)! while for the permutation is n!/(n - r)!. Combination is the arrangements of objects in which order does not matter. Permutation is the arrangements of objects in which order matters.
