Ans: C
I is not an arithmetic sequence.It is because $\pi^{45} – \pi^{30} \neq \pi^{60} – \pi^{45}$.
I is not an arithmetic sequence.It is because $\pi^{45} – \pi^{30} \neq \pi^{60} – \pi^{45}$.
II is an arithmetic sequence. It is because $45\pi – 30\pi = 60\pi – 45\pi = 15\pi$.
III is an arithmetic sequence. It is because $(\pi-45) – (\pi – 30) = (\pi – 60) – (\pi – 45) = 15$.
