How to get the result of only first N terms of a geometric series like $1+Ax+Ax^2+Ax^3+Ax^4+Ax^5$....
3356
Why $\sum_{k=0}^m x^k $ is equal to $\dfrac{x^{m+1}-1}{x-1} $?
26790
Proving the geometric sum formula by induction
131326
How to find $\sum_{r\ge 0} \binom{n}{r}\binom{n-r}{r} 2^{n-2r}$?
132081
Geometrical interpretation of $(\sum_{k=1}^n k)^2=\sum_{k=1}^n k^3$
146581
The sum of the first $n$ squares $(1 + 4 + 9 + \cdots + n^2)$ is $\frac{n(n+1)(2n+1)}{6}$
155611
Sum of series $\frac{1}{2 \cdot 3 \cdot 4} + \frac{1}{4 \cdot 5 \cdot 6} + \frac{1}{6 \cdot 7 \cdot 8} + \cdots $
60877
Geometric series and big theta
134610
Find the sum of finite series $S=\sum_{k=1}^{2015}{(-1)^{\frac{k(k+1)}{2}}}k$
110262
Finding a closed formula for $1\cdot2\cdot3\cdots k +\dots + n(n+1)(n+2)\cdots(k+n-1)$
38741
Finding a general formula for summation
48646
A problem with the geometric series and matrices?
15985
simplify $(a_1 + a_2 +a_3+... +a_n)^m$
49192
Technique for finding the nth term
127150
Finding general formula of $\sum_{i=0}^n i^2 \binom{n}{i}$
131080
Geometric representation of the sum of a Geometric Series
117200
Evaluation of $ \sum_{k=0}^n \cos k\theta $
101545
When is the formula for the infinite geometric series valid