Permutation and Combination, both are used to count the ways of possibilities. In simple words, Permutation involves only with arrangements of the objects in various ways that they can be ordered whereas Combination is all about selecting the objects and order does not matter.The formulas for Permutation and Combination are stated as below :
r are non negative integers and r<=n.r
is the size of each permutation.n
is the size of the set from which elements are permuted.!
is the factorial operator.