The sum of `2/(1!) +6/(2!)+12/(3!)+20/(4!)+....` is

Assertion (A) : The value of (2)/(1!) +6/(2!)+(12)/(3!) +(20)/(4!) + .......o = 3e Reason (R) : The n^(th) term of the series 2,6,12,20 , ....... Is n (n+1)

Sum of n terms of (1)/(1.2) + (1)/(2.3) + (1)/(3.4) + …. is

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

Find the sum to n terms of the series , (1)/(1.2)+(1)/(2.3)+(1)/(3.4)+.... ?

What is the sum of 1 1/2+4 1/6+7 1/12+10 1/20 .....up to 20 terms? 1 1/2+4 1/6+7 1/12+10 1/2 .....के 20 पदों तक का योग क्या है?

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

Find the sum -4(1)/(15)+ 3(2)/(20)