Find sum of the following series to n terms and to infinity: `sum_(r=1)^n 1/(4r^2-1)` .

Sum the following series to n terms and to infinity sum_(r=1)^(n)r(r+1)(r+2)(r+3)

Sum the following series to n terms and to infinity 1- (1)/(2) + (1)/(4)-(1)/(8) +....

Sum the following series to n terms and to infinity : (i) (1)/(1.4.7) + (1)/(4.7.10) + (1)/(7.10.13) + ... (ii) sum_(r=1)^(n) r (r + 1) (r + 2) (r + 3) (iii) sum_(r=1)^(n) (1)/(4r^(2) - 1)

Find the sum sum_(r=1)^n r/(r+1)!

Find the sum of the series sum_(r=1)^n rxxr !dot

Find the sum of the series sum_(r=1)^n rxxr !dot

Sum of the series sum_(r=1)^(n) (r^(2)+1)r! is

Sum of the series sum_(r=1)^(n) (r^(2)+1)r! is

Sum of the series sum_(r=1)^(n) (r^(2)+1)r! is

Sum of the series sum_(r=1)^(n) (r^(2)+1)r! is