# 12.5 Sigma Notation and the nth term

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12.5 Sigma Notation and the nth term

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

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

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.

Ex 3 express in sigma notation.

Ex 4 express in sigma notation

Ex 5 Write in sigma notation.