Which term of the series.
`1-1/3 + 1/9 - 1/(27) + …. Is - 1/(243)`?

Prove that the sum to n terms of the series 11 + 103 + 1005 + …. Is (10/9) (10^(n)-1)+n^(2) .

Which term of the sequence 24, 23 1/4, 22 1/2, 21 3/4, ….. is the first negative term ?

Which term of the sequence : 20,19 1/4, 18 1/2, 17 3/4 , ..... is the first negative term ?

Which term of the following sequence:- 1/3,1/9,1/27 ,.....is 1/19683 ?

Find the sum of the series – 1 + 5 + 11 +….to n terms.

which term of the following sequence : 1/3^1 , 1/3^2 , 1/3^3 ...is 1/3^5 ?

Sum of infinite terms of the series cot^(-1) ( 1^(2) + 3/4) + cot^(-1) ( 2^(2) + 3/4) + cot^(-1) ( 3^(2) + 3/4) + ... is

The rth term of the series 2(1/2)+1(7/13)+1(1/9)+20/23+..... is

Find the sum of n terms \ of the series: 1/(1. 2)+1/(2. 3)+1/(3. 4)+dot+ 1/n dot((n+1))

Find the sum of the series : 1+ 2/3+1/3+0 +…….. To 19 terms.