sum `-2,2 1/2,-3 1/8,......` to 6 terms .

Sum of -2,2(1)/(2),-3(1)/(8)... upto 6 terms is

Find the sum of the GP: (i) 1+3+9+27+... to 7 terms (ii) 1+sqrt(3)+3+3sqrt(3)+... to 10 terms (iii) 0.15+0.015+0.0015+... to 6 terms (iv) 1-1/2+1/4-1/8+... to 9 terms (v) sqrt(2)+1/sqrt(2)+1/(2sqrt(2))+... to 8 terms (vi) 2/9-1/3+1/2-3/4+... to 6 terms

Find the sum : 1+1.2+1.4+1.6+1.8+... (upto 21 terms)

Find the sum 2+3fr1/2+5+6fr1/2 +....... upto 25th term.

1,2,3, …… sum to 10 term is ………….

1,2,3…..sum of 20 term is

Find the sum of n-terms: [(1/1)+(1^3 +2^3)/2 +(1^3 +2^3 +3^3)/3+....to n -terms

Find the sum of n terms of the series 1/2.5+1/5.8+1/8.11 …to n terms.