Army Group X Solved Paper

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Question : 33 of 50

Marks: +1, -0

C(n,r)+2C(n,r−l)+C(n,r−2)=?

C(n+1,r)‌‌
C(n+2,r)
C(n+2,r−l)‌‌
C(n+1,r−1)

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