Sum to n terms of the series
`(1)/(1.2.3.4)+(1)/(2.3.5.6)+(1)/(3.4.5.6)+ . . .. . `, is

Sum of n terms of the series 1/(1.2.3.4.)+1/(2.3.4.5) +1/(3.4.5.6)+....

Sum of n terms of the series 1/(1.2.3.4.)+1/(2.3.4.5) +1/(3.4.5.6)+....

Find the sum to n terms of the series (1.2.3) + (2.3.4) + (3.4.5) ...

FInd the sum of infinite terms of the series 1/(1.2.3)+1/(2.3.4)+1/(3.4.5).....

If the sum of n term of the series (5)/(1.2.3) + (6)/(2.3.4) + ( 7)/(3.4.5)+"…." is a/2 - (n+b)/((n+1)(n+2)) , then

Find the sum to n terms of the series: 1/(1. 3)+1/(3. 5)+1/(5. 7)+

Sum up to n terms of series (1)/(2)+(3)/(6)+(5)/(18) + ...

Sum of n terms of the series (2n-1)+2(2n-3)+3(2n-5)+... is

Find sum to n terms of the series 1+(2+3)+(4+5+6)+"...." .

Sum to n terms of the series 1^(3) - (1.5)^(3) +2^(3)-(2.5)^(3) +…. is