defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Permutations and Combinations

C(n, r) +2C(n, r - 1) + C(n, r - 2) = ?

1

C(n + 1, r)

2

C(n + 2, r)

3

C(n + 2, r - 1)

4

C(n + 1, r - 1)

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