Calculate $S_8$ given $t_1 =8$ and $r=-1/2$

$\sum_{n=1}^{5} (\frac{1}{i})^n=$

For an A.P. if $t_1$ is 3 and $t_{10}$ is 39 then $S_{10}$ is

$\sum_{n=1}^{\infty} (\frac{1}{5^n})=$

Find the 10th term of the sequence: $\frac{1}{8} , \frac{1}{3} , \frac{-1}{2} , \frac{-1}{7} ,....$

$\sum_{k=1}^{5} (k^2 -2)=$

Sum of the series $0.2 + 0.02 + 0.002 + ... $ upto infinite terms is:

$\sum_{n=1}^{\infty} (-e)^{-2n}=$

The series $1+1+1+1+...$ is:

$1+2+3+4+5+....+100$

What is the G.M of 32 and 64

Which of the following series converges?

$1, 1/3, 1/5, 1/7,$ is ______ series:

Two A.Ms between 5 and 11 are:

If $t_n =(\frac{-1}{3})^n t_{n-1}$ and $t_1 = 1$, the series represented by $t_n$ is:

Sum the series upto n-terms: 1+3+5+...

$S_n = n^3 $ for an A.P then $a_n =?$

If 2 and 32 are in G.P. Find their geometric mean

Next number of the series 5, 8, 14, 17, ...

What is the sum of the first 50 natural numbers?

A.M of $1/4$ and $3/8$ is

$\sum_{n=0}^{\infty} (\frac{1}{2^{n-1}})=$

What is the sum of the following series? $8+4+2+...+1/32$

$2+4+8+16+...+$ till $n/2$ terms=?

The 11th term of the series will be: $2, 5/2, 3, ... $

$\sum_{n=2}^{30} (\frac{-1}{i})^{n}=?$

Calculate the exact value of repeating decimal $0.4545....$

$2, 2, 2, 2, 2, 2$ is an arithmetic sequence with a common difference

$2+4+6+....+100$

For an A.P, if $a_{12} = 19$ and $a_{17} =29$, what will be value of common difference?

$5, -15, 45, ....$ . What will be the sign of the $84563214 ^{th} $ term?

9th number of the following series is? 1, 4, 8, 13, 19

What is the geometric mean between 9 and 4?

$\sum_{n=0}^{\infty} (\frac{1}{2^n})=$

What is the nth term of the sequence $1, 3, 5, 7, ...$ ?

What is the difference between A.M and G.M of 5 and 7 ?

Find the sum of the following series: $1^2 + 3^2 + 5^2 +...+n^2$

$\sum_{n=1}^{\infty} (\frac{-3}{7})^{2n}=?$

The H.M between 1/2 and 1/8 is:

Which of the following series has $r=0.5$?

What are three A.Ms between $-18$ and 4 ?