defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Permutations and Combinations Permutation Function and its properties
What is the value of \(\displaystyle\sum_{r = 1}^n\frac{P(n,r)}{r!}\)?
1
2n - 1
2
2n
3
2n-1
4
2n+1