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# Permutation and Combination

Om Prakash Mishra
21/09/2018 0 1

Permutation means arrangement

Fundamental principles of counting

If a work can be done in m ways and the either can be done in n ways, then the no .of ways in which both the works can be done is m×n ways.

But if they are done I depend on each other that is doing of one does not affect the other, then it is m+n.

The no of ways in which n different things can be arranged is n! Which is equal to

n!=n ×(n-1)×.....×2×1.

The no. of ways in which r things out of n things can be arranged is

n^P^r = n!/(n-r)!.

If any particular object is repeated p, q.. times then the result is divided by p! q!... respectively to get the desired permutation.

0 Dislike

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Soumyajit Basak | 24/09/2018

Good Explanation Sir

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