How to add the first power of 15 to the second power of 15 and the third power of 15 to the 100th power of 15

S=15+15^2+15^3+.+15^100
15S=15^2+15^3+15^4+...+15^101
From the following formula to the above formula:
14S=15^101-15
So the original formula = s = (15 ^ 101-15) / 14

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