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Coolmath Algebra
Sequences & Series Lesson 7 - Geometric Sequences (page 4 of 5)
---- This algebra lesson explains geometric sequences.

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term: a1 , term value: 3 ... term: a2 , term value: 3( -2 )^( 1 ) = -6 ... term: a3 , term value: 3( -2 )^( 2 ) = 12 ... term: a4 , term value: 3( -2 )^( 3 ) = -24 ... term: a5 , term value: 3( -2 )^( 4 ) = 48

See the pattern?

Check out the term number and the guy that's changing on the right:

                                  term: a1 , term value: 3( -2 )^( 0 ) ... term: a2 , term value: 3( -2 )^( 1 ) ... term: a3 , term value: 3( -2 )^( 2 ) ... term: a4 , term value: 3( -2 )^( 3 ) ... term: a5 , term value: 3( -2 )^( 4 ) ... term: a50 , term value: 3( -2 )^( 49 )
                                                            Let's just leave it like
                                                            this -- it's a really huge
                                                            number!

So, what's the formula for the nth term?

Continued on the next page

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