Direction: Determine whether each sequence is ARITHMETIC OR GEOMETRIC.If the sequence is arithmetic guve the common difference (d);if geometric,guve the common ratio(r), 1. 2, 6, 18, 54, 162, ...
2. 4, 10, 16, 22, 28,...
3. 625, 125, 25,5
4. 81, 27, 9, 3, 1, ..
5. 2,-2,2-2,2-,2
6. 9,6,3,0, -3, -6-9...
7. 1,½,¼ ⅛,1/16, ...
8. 21, 14,7,9,-7, -14,...
9. 1, 3/2, 2, 5/2,3,7/2,
10. 3, -6, 12, -24, 48, ...
2. 4, 10, 16, 22, 28,...
3. 625, 125, 25,5
4. 81, 27, 9, 3, 1, ..
5. 2,-2,2-2,2-,2
6. 9,6,3,0, -3, -6-9...
7. 1,½,¼ ⅛,1/16, ...
8. 21, 14,7,9,-7, -14,...
9. 1, 3/2, 2, 5/2,3,7/2,
10. 3, -6, 12, -24, 48, ...
Answers & Comments
Answer:
The following answers are in bold texts.
1. Geometric, r = 3
2. Arithmetic, d = 6
3. Geometric, r = 5
4. Geometric, r = 3
5. Geometric, r = -1 ( 2, -2, 2, -2, 2, -2, 2 )
6. Arithmetic, d = -3
7. Geometric, r = 2 ( Divided by 2, with the quotient in fraction form)
8. Arithmetic, d = -7 ( 21, 14, 7 , 0, -7, -14 )
9. Arithmetic, d = 3
10. Geometric, r = -2