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- An = A1 + (n-1)r
- a) a4 = a2 + 2r
- 2 + 2r = 6
- r = 2
- a1 = 2 - 2
- a1 = 0
- An = 0 + (n - 1)2
- b) a5 = a2 + 3r
- 9 = 0 + 3
- r = 3
- a1 = 0 - 3
- a1 = -3
- An = -3 + (n - 1)3
- c) a10 = a4 + 6r
- -10 = 2 + 6r
- r = -2
- a1 = a4 - 3r
- a1 = 8
- An = 8 (n - 1)-2
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