Permutation and combination shortcut formula for bank exams
Permutation and combination important formulas and facts
Permutation :Important point to note
- Number of all permutation of n things all at a time is n!
- If there are n objects ,m numbers are alike Then number of permutations of these objects is :n!/(m!)
- If there are n objects ,p1 numbers are alike of one kind,p2 objects are alike of another kind,p3 are alike of third kind and so on and pr are alike of rth kind,such that p1+p2+p3+……pr=n Then number of permutations of these objects is : n!/(p1!.p2!…..pr!)