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Sum of series x*(1+k)^(n-1)



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The solution

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  12                
 ___                
 \  `               
  \            n - 1
  /   x*(1 + k)     
 /__,               
n = 1               
$$\sum_{n=1}^{12} x \left(k + 1\right)^{n - 1}$$
Sum(x*(1 + k)^(n - 1), (n, 1, 12))
The answer [src]
  /               2          3          4          5          6          7          8          9          10          11\
x*\2 + k + (1 + k)  + (1 + k)  + (1 + k)  + (1 + k)  + (1 + k)  + (1 + k)  + (1 + k)  + (1 + k)  + (1 + k)   + (1 + k)  /
$$x \left(k + \left(k + 1\right)^{11} + \left(k + 1\right)^{10} + \left(k + 1\right)^{9} + \left(k + 1\right)^{8} + \left(k + 1\right)^{7} + \left(k + 1\right)^{6} + \left(k + 1\right)^{5} + \left(k + 1\right)^{4} + \left(k + 1\right)^{3} + \left(k + 1\right)^{2} + 2\right)$$
x*(2 + k + (1 + k)^2 + (1 + k)^3 + (1 + k)^4 + (1 + k)^5 + (1 + k)^6 + (1 + k)^7 + (1 + k)^8 + (1 + k)^9 + (1 + k)^10 + (1 + k)^11)

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