Find the following sums :
1+3+5+ .... + 99

Find the sum: -2(1)/3+4 (3/5)

Find the sum of the following APs : (1)/(15), (1)/(12), (1)/(10),.. , to 11 terms

Find the sum of indicated number of terms in each of the following Aps (i) 16, 11,6,….., 23 terms (ii) -0.5, -1.0, -1.5 ,………,10 terms (iii) -1,1/4,3/2 ,…..10 terms

Find the sum of the following series to n terms 5+7+13+31+85+

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

Find the sum: (-3)/(-11)+ (5/9)