The common difference of the $\text{AP}\frac{1}{\text{3}},\frac{1-3\text{b}}{\text{3}},\frac{1-6\text{b}}{\text{3}},....$ is:
- A$\frac{1}{3}$
- B$\frac{-1}{3}$
- C$\text{b}$
- ✓$-\text{b}$
Answer: D.
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Answer: D.
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