defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Permutations and Combinations Combination Function and its properties
What is C(n, r) + 2C(n, r + 1) + C(n, r + 2) equal to?
1
C(n + 1, r)
2
C(n + 1, r + 2)
3
C(n + 2, r + 2)
4
C(n + 2, r + 3)