### Home > PC > Chapter 2 > Lesson 2.3.1 > Problem 2-72

2-72.

All of the numbers in the series are multiples of 4.

The numbers in this series are all powers of 2.

It may be easier to start with an index of *k* = 0 instead of *k* = 1.

All of the numbers in the series are multiples of 2.