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Summation calculation results:

If the ratio of each term to the preceding term is equal to the same constant from the second term onwards, the sequence is called a proportional sequence.

This constant is called the common ratio of the geometric series, usually denoted by the letter q (q is not equal to 0), and the geometric series a1 is not equal to 0. Note that when q=1, an is a constant series.

General formula:

an = a1*q^(n-1)

The first N terms of the geometric series and the calculation formula:

Sn=a1(1-q^n)/(1-q)