1. 12.5 Sigma Notation and the nth term

3. Ex 1 write each expression in expanded form and then find the sum.

4. Ex 2 express the series using sigma notation
…+ 61
…+ 143

5. Not all sequences are arithmetic or geometric
Not all sequences are arithmetic or geometric. Some sequences ar generated by product of consecutive integers. The product n(n – 1)(n – 2)…3 x 2 x 1is called n factorial and symbolized n!.
n! = n(n – 1)(n – 2)…1
By definition 0! = 1.

6. Ex 3 express in sigma notation.

7. Ex 4 express in sigma notation

8. Ex 5 Write in sigma notation.…