1. a1=−1, a2=1, a3=3, a4=5, a5=7
3. a1=13, a2=25, a3=37, a4=49, a5=511
5. an=32−2n
7. 9
9. n+1
11. 100
13. 1343140
15. ∑k=1501k
17. Arithmetic; a1=11, d=−5
19. Not arithmetic
21. an=3n
23. an=x+n−1
25. d=2, an=2n+1
27. 352
29. 4020
31. Geometric: a1=4, r=−2
33. Not geometric
35. a1=16, r=− 14, an=(−1)n−14n−3
37. a10=39, 366
39. S12=8192
41. 34
43. 32
47. 792
49. (x−3)4=x4−12x3+54x2−108x+81
51. 101, 376x5
53. 24
55. 5040
57. 120
59. 120
61. 3696
63. 15,120
65. 12
67. 25
69. 1528
71. 117
73.
19
49
59
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