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Source: OG11th
Level: 3
P, r, s, t, u
An arithmetic sequence is a sequence in which each term after the first is equal to the sum of the preceding term and a constant. If the list of letters shown above is an arithmetic sequence, which of the following must also be an arithmetic sequence?
I 2P, 2r, 2s, 2t, 2u
II P-3, r-3, s-3, t-3, u-3
III 
, 
, 
, 
, 
- A I only
- B II only
- C III only
- D I and II
- E IIandIII