3 5 9 17 33. The formula works for any real. Letting a be the first term here 2 n be the number of terms here 4 and r be the constant that each term is multiplied by to get the next term here 5 the sum is given by.
As the index increases each term will be multiplied by an additional factor of 2.
I can also tell that this must be a geometric series because of the form given for each term. Sum of a Finite Geometric Series uizmaster. A Sequence is a set of things usually numbers that are in order. We know that a geometric series the standard way of writing it is were starting n equals typical youll often see n is equal to zero but lets say were starting at some constant.