GATE Electrical 2015 Set 2 | GA Question: 9

Question

If the list of letters, $P, R, S, T, U$ is an arithmetic sequence, which of the following are also in arithmetic sequence?

1. $2P, 2R, 2S, 2T, 2U$
2. $P-3, R-3, S-3, T-3, U-3$
3. $P^{2}, R^{2}, S^{2}, T^{2}, U^{2}$

• A. $I$ only
• B. $I$ and $II$
• C. $II$ and $III$
• D. $I$ and $III$