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Explicit Formula: a n = a 1 ∙ r n-1 . Recursive Formula : a n =r ∙a n-1 . Partial Sum Formula: S n = a 1 ( 1- r n 1-r ) Geometric: Determine if the sequence is arithmetic, geometric, or neither. If arithmetic, state the common difference. If geometric, state the common ratio. 3, 6, 9, 12, 15,… b. 2, 8, 32, 128, 512,… ................
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