UPSC NDA Math Model Paper 6

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Question : 89 of 120

Marks: +1, -0

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

C (n + 1, r)
C (n + 2, r)
C (n + 2, r – 1)
C (n + 1 , r – 1 )

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