Find the sum `2+5+10+17+26+. . . .`

Find the sum 1+ 3/5 + 5/25 + 7/125 +...

Find the sum of 1+3+5+…+55

The sum to n terms of the sequence 5, 11, 17, 23, ….. is 320 Then n = .

Find the sum 1+4/5+7/(25)+(10)/(125)+ . ..

Find the sum upto the 17^(th) term of the series 1^(3)/1 + (1^(3)+2^(3))/(1+3) + (1^(3)+2^(3)+3^(3))/(1+3+5)+...

Find the sum up to the 17^(th) term of the series (1^3)/(1) + (1^3 + 2^3)/(1+3) + (1^3 + 2^3 + 3^3)/(1+3+5)+ ….