I don't left enough tutor question, if possible, pls answer all the 3 questions, thank you very much!(I will give positive rate certainly)

Problem #8: What is the smallest number of terms of the series 00 l 2 (-1)" +1 "2 4,, that would have to be added in n=l order to estimate its sum with an absolute error that is less than .00]? Problem #9: Which of the following series are conditionally convergent? n (i) i (#1)]: arctan )1 n=1 (ii) 2 (1)\"'1g,,'+2 n:1 (iii) 2 {12m1 ":2 1n n (A) (ii) only (B) (i) and (iii) only (C) all of them (D) (i) and (ii) only (E) (i) only (F) (ii) and (iii) only (G) none of them (H) (iii) only Problem #10: Use the ratio test to determine which of the following series converge. , 10" (\"Elm\")! 00 _ n 11-] n=l (A) (ii) only (B) none of them (C) (iii) only (D) (i) and (ii) only (E) all of them (F) (ii) and (iii) only (G) (i) only (H) (i) and (iii) only