engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Permutations and Combinations

C (n, r – 1) + 2C (n, r – 2) + C (n, r – 3) = ?

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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