Exercise 3.3
Exercise 3.3
Exercise 3.3
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MA111: Prepared by Dr.Archara Pacheenburawana 52<br />
Answer to <strong>Exercise</strong> 7.2<br />
1.<br />
20<br />
3<br />
2. D 3. 15 4. 1 7<br />
5. D 6. D 7. 3 4<br />
8. 17<br />
36<br />
9. D 10. 3 2<br />
11. D 12. D<br />
13.<br />
31<br />
6<br />
14. D 15. −1 16. D 17.<br />
e 2<br />
π(π−e)<br />
18. 3<br />
n=1<br />
<strong>Exercise</strong> 7.3<br />
Determine whether the series converges or diverges.<br />
∞∑ 1<br />
∞∑ 1<br />
∞∑<br />
1.<br />
2.<br />
3. ne −n<br />
n 4 3n+1<br />
n=1<br />
n=1<br />
n=1<br />
∞∑ 1<br />
4.<br />
5. 1+ 1 n 1.0001 8 + 1 27 + 1<br />
64 +··· 6. ∑ ∞<br />
5−2 √ n<br />
n 3<br />
n=5<br />
n=1<br />
∞∑<br />
∞∑ n<br />
∞∑ 1<br />
7. ne −n2 8.<br />
9.<br />
n 2 +1<br />
nlnn<br />
n=1<br />
n=1<br />
n=2<br />
∞∑ arctann<br />
∞∑ 1<br />
∞∑ −2<br />
10.<br />
11.<br />
12. √<br />
1+n 2 n 2 +2n+2 n+2<br />
13.<br />
16.<br />
19.<br />
22.<br />
25.<br />
28.<br />
31.<br />
34.<br />
37.<br />
40.<br />
∞∑<br />
n=2<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
7<br />
4n+2<br />
1<br />
n 2 +n+1<br />
14.<br />
17.<br />
3<br />
n2 n 20.<br />
3+cosn<br />
3 n 23.<br />
1<br />
1+ √ n<br />
26.<br />
n+1<br />
n2 n 29.<br />
n<br />
n 2 +2n+3<br />
32.<br />
n!<br />
n 100 35.<br />
n+3<br />
n 2√ n<br />
1<br />
(2n)!<br />
38.<br />
41.<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
3<br />
(4+3n) 7/6 15.<br />
5<br />
2+3 n 18.<br />
1<br />
√<br />
n(n+1)(n+2)<br />
21.<br />
n<br />
√<br />
n5 +4<br />
n 2 +1<br />
n 4 +1<br />
1<br />
n!<br />
1<br />
n √ n+1<br />
n 3<br />
(2n)!<br />
n 2<br />
n!<br />
24.<br />
27.<br />
30.<br />
33.<br />
36.<br />
39.<br />
sin2n<br />
n 2 42.<br />
n=1<br />
∞∑<br />
n=2<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
∞∑<br />
n=1<br />
ne −3n2<br />
n+1<br />
n 2<br />
n 2 +1<br />
n 3 −1<br />
2 n<br />
1+3 n<br />
1+n+n 2<br />
√<br />
1+n2 +n 6<br />
( 1<br />
sin<br />
n)<br />
8 n<br />
n!<br />
n<br />
n+200<br />
4n 3 +3n<br />
n 5 −4n 2 +1<br />
n(−3) n<br />
4 n−1