For each of the following series, tell whether or not you can apply the 3-condition test (i. e. the alternating series test). Enter D if the series diverges by this test, C if the series converges by this test, and N if you cannot apply this test (even if you know how the series behaves by some other test).
1. ∑n=2 to [infinity]((−1)^n(n^4+2^n))/(n^3−1)
2. ∑n=1 to [infinity](−1)^n/n^5
3. ∑n=1 to [infinity] ((−1)^ncos(n))/(n^2)
4. ∑n=1 to [infinity] (((−1)^n(n^3+1))/(n^3+7)
5. ∑n=1 to [infinity]((−1)^n(n^10+1))/e^n
6. ∑n=1 to [infinity](((−1)^n(n^3+1))/(n^4+1)