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Which of the following statements is true for the series the summation from n=0 to infinity of (-1)^n and 5/4^n?

a) The series diverges because it is geometric with r = 5/4 and a = –1.
b) The series converges to 4 because it is geometric with r = -1/4 and a = 5.
c) The series converges to –1 because it is geometric with r = -1/4 and
a = -5/4.
d) The series diverges because it is geometric with r = -5/4 a = 1.

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2 answers

  1. well, r = -5/4, so ...

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  2. Isn't the series convergent though?

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