Write the sum of the series `i+i^2+i^3+.......` upto `1000` terms.

Fill in the blanks of the following The sum of the series i+i^(2)+i^(3)+i^(4)+.... upto 1000 terms is ....

Find the sum of the series 1+3x+5x^2+7x^3+.......... upto n terms.

Find the sum of the series 1+3x+5x^2+7x^3+.......... upto n terms.

The sum of the series i+2i^(2)+3i^(3)+... up to 200 terms equals

Find the sum of the series 1+3x+5x^(2)+7x^(3)+...... upto n terms.

The sum of the series (2)^2+2(4)^2+3(6)^2+.... upto 10 terms is

Find the sum of the following series : (i) 1,3,5,7... upto 12 terms.

Find the sum of the following series: ( i ) 1,3,5,7... upto 12 terms.

Sum of the series 1+3+7+15+....... upto n terms.

if i^2 =-1, then the sum i+ i^2 + i^3 +......... to 1000 terms is equal to