Write a geometric sequence in summation notation

The video tutorial explains how to write a geometric sequence in summation notation. It begins by introducing the concept of summation notation and the sigma symbol. The instructor then demonstrates how to determine the rule for a geometric sequence by identifying the first term and the common ratio. Finally, the sequence is expressed in sigma notation, with an explanation of how to set the starting point and upper limit for the sequence.

What is the general rule for the n-th term of a geometric sequence?

How do you determine the first term (a sub 1) in a geometric sequence?

Explain how to find the common ratio (r) in a geometric sequence.

What is the significance of starting at n equals 1 in summation notation?

How many terms are there in the given geometric sequence?