Find the sum to n terms of each of the following series :
`(1)/(1.3) + (1)/(3.5) + (1)/(5.7) +…`

Find the sum to n terms of each of the following series : (1)/(1.4) + (1)/(4.7) + (1)/(7.10)+…

Find the sum to n terms of each of the following series : (1)/(2.5) + (1)/(5.8) + (1)/(8.11)+…

Find the sum to n terms of each of the following series : (1) + (1+2) + (1+2+3)+…

Find the sum to n terms of each of the following series : (1) + (2+3) + (4+5+6)+…

Find the sum to n terms of each of the following series : 1.3 .5 + 3.5.7 + 5.7.9+…

Find the sum to n terms of each of the following series : 1^(2) + 3^(2) + 5^(2) +…

Find the sum of n terms of the following series : 1+3+7+13 +......

Find the sum to n terms of the following series : 3+5xx 1/4+7xx1/4^2 + .....

Find the middle term (or terms) and the sum of each of the following series : (1)/(2) + (1)/(3) + (1)/(6)+…+(-(5)/(6))

Find the sum to n terms of the following series : 1+3/2+5/2^2+7/2^3 + ...........