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""^(n) C(r+1)+2""^(n)C(r) +""^(n)C(r-1)=...

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

A

`""^((n+1))C_(r + 1)`

B

`""^(n+2)C_r`

C

`""^(n+2)C_(r+1)`

D

`""^(n+1)C_r`

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-BINOMIAL THEOREM-EXERCISE - II
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  14. If ak is the coefficient of x^k in the expansion of (1 +x+x^2)^n for k...

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  15. Find the sum of the following (""^(15)C(1))/(""^(15)C(0))+2(""^(15)C...

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  16. If a0, a1 , a2 …..an are binomial coefficients then (1 + a1/a0)(1 +a2/...

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