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Square minus a Square
factors into
(a+b)(ab)
conjugates 


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A list of ordered numbers. The numbers do not have to be numerically consecutive. 


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Using one term to find the next term.
Arithmetic: a_{n}=a_{n1}+d
Geometric: a_{n}=r^{ . }a_{n1} 


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An equation to find any term of a sequence.
Arithmetic: a_{n}=a_{0}+dn
Geometric: a_{n}=a_{1}^{.} r^{n1} 


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A sequence where you add a common difference, d, to each term to get the next consecutive term. 


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A sequence where you multiply each term by a common ratio, r, to get the next consecutive term. 


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Sum of the terms of a sequence. 


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The sum of the first n terms of a sequence.
The formulas for arithmetic and geometric partial sums are given on your reference sheet. 


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 An infinite arithmetic series has no limit.
 An infinite geometric series has no limit when ιrι>1.
 An infinite geometric series has a finite limit when ιrι<1.
 S_{n}=a_{1}/(1r)



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