Find the sum of the following geometric series:`2/9-1/3+1/2-3/4+ to\ 5\ ` terms.

Find the sum of the following geometric series: 1,\ -a,\ a^2,-a^3,... to\ n terms (a!=1)

Find the sum of the following geometric series: (2)/(9)-(1)/(3)+(1)/(2)-(3)/(4)+rarr5 terms

Find the sum of the following geometric series: 1,-1,a^(2),-a^(3),rarr n terms (a!=1)

Find the sum of the following geometric series : 1+(1)/(4)+(1)/(16)+(1)/(64) +… to 10 terms

Find the sum of the infinite geometric series 1+3x+9x^2+27x^3+…..

Find the sum of the infinite geometric series 1+3x+9x^2+27x^3+…..

Find the sum of the following series : 1.2+2.3+3.4+ .... to n terms .

Find the sum of the following series: 1+5+3+9+5+13+7+… 20 terms

Find the sum of the infinite geometric series (1-1/3+1/3^(2)-1/3^(3)+...oo) .

Find the sum of the following geometric series: (a)/(1+i)+(a)/((1+i)^(2))+(a)/((1+i)^(3))++(a)/((1+i)^(n))