" The sum of "1+(2)/(5)+(3)/(5^(2))+(4)/(5^(3))+..." upto "n" terms is "

1^(2) + 3^(2) + 5^(2) + …. upto n terms =

The sum of the series (2)/(1.2)+(5)/(2.3)2^(1)+(10)/(3.4)2^(2)+(17)/(4.5)2^(3)+.... upto n terms is equal:

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

Sum up to n terms the series 1-(2)/(5)+(3)/(5^(2))-(4)/(5^(3)) + ...

If S_(n)=(1.2)/(3!)+(2.2^(2))/(4!)+(3.2^(3))/(5!)+... upto n terms then the sum infinite terms is

The sum of the series (3)/(1^(2))+(5)/(1^(2)+2^(2))+(7)/(1^(2)+2^(2)+3^(2))+...... upto n terms,is

77.The sum of the series 1.3^(2)+2.5^(2)+3.7^(2)+.... upto 25 terms

Find the sum, (i) 4-(1)/(n)+4-(2)/(n)+4-(3)/(n) …………upto n terms (ii) 1+(-2)+(-5)+….+(-236) .

The sum of the series (9)/(5^(2)*2*1)+(13)/(5^(3)*3*2)+(17)/(5^(4)*4*3)+... upto infinity