Answer:
1. B
2. both C and D (but still choose D if in trouble)
3. A
4. D
5. A
6. B
7. A
8. A
9. C
10. B
11. B
12. C
13. A
14. D
15. A
16-20. (only when X ≠ 0) Formula: ✓ab
✓ (1/X)(X) = ✓ 1 = ± 1 (since X and 1/X are 1 term apart)
The geometric mean of X and 1/X provided that X ≠ 0 can be 1 or -1.
Check: 8, 1, 1/8 and 8, -1, 1/8 are both geometric sequences with their respective ratios ⅛ and -⅛.
Step-by-step explanation:
Geometric sequences! One of my favorites.
That's all. Hope you get the perfect score.
