[" Sum of the series "],[S=1+(1)/(2)(1+2)+(1)/(3)(1+2+3)+(1)/(4)],[(1+2+3+4)+..." upto "20" terms is "]

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:

The sum of the series (1)/(1.2)-(1)/(2.3)+(1)/(3.4)-(1)/(4.5)+... 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

Find the sum of the geometric series : 1,(1)/(2),(1)/(4),(1)/(8), . . . .. . . . . . upto 12 terms.

the sum of the series (1)/(2!)-(1)/(3!)+(1)/(4!)- upto infinity is

The sum of the series (1)/(1*2)-(1)/(2*3)+(1)/(3*4)--- upto oo is equal to

Find the sum of the series, (1^(3))/(1)+(1^(3)+2^(3))/(1+3) + (1^(3)+2^(3)+3^(3))/(1+3+5)+.... upto nth term.

Find sum of the series upto n terms 1+(1+2)/(2)+(1+2+3)/(3)+(1+2+3+4)/(4)+

Sum of the series (1)/(4.1^(2)-1)+(1)/(4.2^(2)-1)+(1)/(4.3^(2)-1)+ upto infinite terms is a.(3)/(2)(2)(1)/(2)(3)1(4) infinite