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Unformatted text preview: r , called the common ratio , such that a n = ra n-1 , for every n > 1, r . Solving for r : r = a n a n 1 The nth term of a geometric sequence is: a n =a 1 r n-1 , where a 1 =first term; r=common ratio. The Sum of the First N Terms of a Geometric Sequence is: S N = a 1 r N 1 r , r 0,1 where a = first term, r = common ratio. The Sum of an Infinite Geometric Series S = ar k 1 k = 1 with common ratio |r|<1 is: S = a 1 r , where a = first term, r = common ratio....
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- Fall '11