1.

For ""^(n) C_(r)+ 2""^(n) C_(r-1)+ ""^(n) C_(r-2)=

Answer»

(a)`""^(n+1) C_(R-1) `
(B)` ""^(n+2) C_(r+1)`
(C)` ""^(n+2) C_(r)`
(d)` ""^(n+2)C_r`

ANSWER :D


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