NDA Math Permutations and Combinations

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Question : 43 of 65

Marks: +1, -0

What is C(n,r)+2C(n,r−1)+C(n,r) equal to?

[NDA I 2018]

C(n+1,r)
C(n−1,r+1)
C(n,r+1)
C(n+2,r)

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