On this week, we have learned about geometric sequence and series. Geometric sequence could be defined as the arranged numbers that have constant common ratio. If you want to get , you can use the formula. –> = x

Geometric Series is sum of all the arranged number of geometric sequence. But the thing is that, there are two kinds of geometric series. They are ‘FINITE GEOMETRIC SERIES” and “INFINITE GEOMETRIC SERIES”. First of all, if you want to get series of finitie geometric series, you can use the formula.

–> = a ( – 1) / (r-1)

If you want to get “INFINITE GEOMETRIC SERIES”, you should observe the common ratio first. If the common ratio is bigger than negative 1, and smaller than positive 1, it has a sum.

formula–> = / (r-1)

If the common ratio is bigger than positive 1 or smaller than negative 1, it has no sum.