Sum of n terms of Geometric Progression Sequence | GP Series

Sum of N term of GP
Suppose a, ar, ar², ar³,……ar^n-1 is the given Geometric Progression.
Then the sum of n terms of GP is given by:
Sn = a+ar+ar²+ ar³+…+ar^n-1
The formula to find sum of n terms of GP is:
Sn = a[(r^n-1)/(r-1)] if r ≠ 1

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