Find the sum to `n` terms of the series: `1/(1. 3)+1/(3. 5)+1/(5. 7)+`

Find the sum of n terms \ of the series: 1/(1. 2)+1/(2. 3)+1/(3. 4)+...............+1/(n.(n+1))

find the sum upto n terms of the series (1)/(1*3)+(1)/(3*5)+(1)/(5*7)+...

Find the sum to n terms of the series: 1+5+12+22+35+...

Find the sum to n terms of the series 1.2.3+2.3.4+3.4.5+…

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.

Find the sum of 100 terms of the series 1(3) + 3(5) + 5(7)+ ….

Find the sum of n terms of the series 1.3.5+3.5.7+5.7.9+dots