Determine if the following sequence is an arithmetic sequence or a geometric sequence. Write AS for arithmetic sequence and GS for geometric sequence. Find their common difference or common ratio.
1) 3, 7, 11, 15, 19
2) 1, 4, 9, 26, 25
3) 32, 16, 8, 4,2
4) 5,-25, 125, -625, 3125
5) 120, 60, 30. 15
6) 9.5, 7.5,5.5, 3.
7) 2. 10. 50, 1250 20
8) 1.-4. 16.-64, 256
1) 3, 7, 11, 15, 19
2) 1, 4, 9, 26, 25
3) 32, 16, 8, 4,2
4) 5,-25, 125, -625, 3125
5) 120, 60, 30. 15
6) 9.5, 7.5,5.5, 3.
7) 2. 10. 50, 1250 20
8) 1.-4. 16.-64, 256
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Answer:
1. AS
2. AS
3. GS
4. GS
5. GS
6. AS
7. GS
8. GS
Common Ratio: r = a2/a1
Common Difference: d = a2-a1
1. d = 4
2. d = 3
3. r = 1/2
4. r = -5
5. r = 1/2
6. d = 2.5
7. r = 5
8. r = -4
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