tell whether the given sequence is arithmetic, a geometric or neither. if it is an arithmetic, find the common difference. If it is an geometric, find common ratio.
1. 2,1,½,¼,⅛...
2. 3,-12,48,-192...
3. ½,¼,⅙,⅛...
4. -8, -2, -½, -⅛...
5. 1, -1, 1, -1...
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Answer:
1. geometric - 1/2
2. geometric - -4
3. neither
4. geometric - 1/4
5 arithmetic - 2
Step-by-step explanation:
d = a_2 - a_1
r = a_2/a_1