Sigma Notation

Review:

If __is the sequence term (the nth term in a sequence), A{n} is the corresponding value.

• Solve for the first four terms using the explicit formula, A{n} =3/2 n - 2

• Add the values of A{1}, A{2}, A{3}, and A{4}

Plug is A1, A2, A3

What is sigma?

When the values of a sequence (A{n}) are added together, the resulting expression is a series.

• Mathematics often uses sigma notation to write a series.

Define each part of the following sigma notation.

Find the sum of the following series.

Find the sum of the following series.

Find the sum of the following series.

****NOTICE!!! NO ( )!!!!!

PEMDAS says that the “-1” comes AFTER the sum of all the A{n} values.