PERMUTATION AND COMBINATION - 4
Factorial notation :-
0! = 1
N! = N(N-1)(N-2).....3.2.1
1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800
Exception 1 / (-2)! = 0
Q. In how many ways 4 boys can be arranged on 4 chairs ?
Sol.
Total no of ways to arrange = 4! = 24
Explanation :-
Boy 1 has 4 option
Boy 2 has 3 option
Boy 3 has 2 option
Boy 4 has 1 option
Conclusion
There are n - different objects and we have to arrange / permutation them linearly than
total no. of ways = n !
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