" (i) "(1)+(1+2)+(1+2+3)+

Sum to n terms the series 1 + (1+ 2) + (1 + 2 + 3) + (1 + 2 + 3 + 4).......

Find the sum: 1 + (1)/(2) (1 + 2) + (1)/(3) (1 + 2 + 3) + ……up to 16 terms.

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

Sum up 1 + (1+2)+(1+ 2+3) +...+(1+2+3+...+ n ) .

Find the sum of the series 1+ (1+2) + (1+2+3) + (1+2 + 3 +4)+ … + (1+2+3+… + 20) .

1 + (1 +2) + (1 + 2 + 3) + …. To n term is

The sum of the series : 1 + (1)/(1 + 2) + (1)/(1 + 2 + 3)+ .... up to 10 terms, is