4. Which of the following statements are true about the series (-1)" In(n)? n² 8] n=1 I Series is convergent. II Series is absolutely convergent. III Series is conditionally convergent. (a) I and II only. (b) II only. (c) I only. (d) II and III only. (e) none of I, II, or III are true.

19. Which of the following statements about the series Σ (-1)"n 2 n=1 n+1 (A) The series can be shown to diverge by comparison with 00 is true? n n= (B) The series can be shown to diverge by limit comparison with (C) The series can be shown to converge by comparison with 00 n=1 n M 2 (D) The series can be shown to converge by the alternating series test. -1=

th 15. A certain series has an n" partial sum given by S , %3D а +а, + + a, n Which of the following is true about the series? a. The series converges, but there is not enough information given to determine the sum. b. The series diverges. c. The series is convergent and its sum is 0. d. There is not enough information to determine whether or not the series converges.

3) 1,2,3