Find the sum : `1/2+1/4+1/9`

Find the sum: 5/9+\ 6+1 5/7

Find the sum 1+1/(1+2)+1/(1+2+3)+..........+1/(1+2+3+.........+n)dot

Find the sum 1+1/(1+2)+1/(1+2+3)++1/(1+2+3++n)dot

Find the sum 2017+1/4(2016+1/4(2015+…+1/4(2+1/4(1))..))

Find the sum of: 24 terms and n terms of 2 (1)/(2) , 3 (1)/(3) , 4 (1)/(6) ,5 ,......,

Find the sum of G.P. : 1+3+9+27+ . . . . .. . to 12 terms.

Find the sum of G.P. : 1-(1)/(2)+(1)/(4)-(1)/(8)+ . . . .. . . .. . to 9 terms .

Find the sum (-4/9 + (-5)/12 + 1/18)

Find the sum of the series 1/(3^2+1)+1/(4^2+2)+1/(5^2+3)+1/(6^2+4)+oo

Find the sum to n terms of the series (1)/(1*3*5*7*9)+(1)/(3*5*7*9*11)+(1)/(5*7*9*11*13)+"......" . Also, find the sum to infinty terms.