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The value of sum(r=2)^n (-2)^r|(n-2C(r-...

The value of `sum_(r=2)^n (-2)^r|(n-2C_(r-2),n-2C_(r-1),n-2C_r),(-3,1,1),(2,-1,0)|(n > 2)`

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The value of sum_(r=0)^(2n)(-1)^(r)*(""^(2n)C_(r))^(2) is equal to :

The value of sum_(r=0)^(2n)(-1)^(r)*(""^(2n)C_(r))^(2) is equal to :

Find the sum sum_(r=1)^n r^2(^n C_r)/(^n C_(r-1)) .

Find the sum sum_(r=1)^(n) r^(2) (""^(n)C_(r))/(""^(n)C_(r-1)) .

Find the sum sum_(r=1)^(n) r^(2) (""^(n)C_(r))/(""^(n)C_(r-1)) .

det[[ The value of the determinant nC_(r-1),nC_(r),(r+1),n+2C_(r+1)nC_(r),nC_(r+1),(r+2),n+2C_(r+2)nC_(r+1),nC_(r+2),(r+3),n+2C_(r+3)]] is

""^(n-2)C_(r)+2""^(n-2)C_(r-1)+""^(n-2)C_(r-2) equals :

Let for n in N, f(n)=sum_(r=0)^(n)(-1)^(r)(C_(r)2^(r+1))/((r+1)(r+2))

""^(n-2)C_(r)+2.""^(n-2)C_(r-1)+""^(n-2)C_(r-2) is equal to