calculus

How do I find the sum of a geometric series from 2 to infinity of -3/ (4^n) ?

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asked by tom
  1. a = -3/4
    r = 1/4
    S(2..āˆž) = Sāˆž - S1

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    posted by oobleck
  2. so s=-13/4?

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    posted by tom
  3. no it should be -1/4

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    posted by tom

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