### Home > PC > Chapter 2 > Lesson 2.3.1 > Problem2-72

2-72.
1. Express the given series using sigma notation, then evaluate the sums with your program or by hand. Homework Help ✎

1. 4 + 8 + 12 + 16 + 20

2. 1 + 2 + 4 + 8 + 16 + 32

3. 2 + 4 + 6 + 8 + … + 200

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.