Which of the following series are alternating series? (Hint: It may be helpful to calculate the first few terms to the series to see if they alternate in sign.) Select all alternating series. 00 (-1)2n O a. Σ n=1 00 O b. cos(an) Σ In(n) n=3 OC. sin(n) Σ n2 . + 우 -우 + 부 + 두 - 루 d. 1+

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