GMAT Problem Solving
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Source: Manhattan
Level: 3
A geometric sequence is one in which the ratio of any term after the first to the preceding term is a constant. If the letters a, b, c, d represent a geometric sequence in normal alphabetical order, which of the following must also represent a geometric sequence for all values of k?
I. dk,ck,bk,ak
II.a+k,b+2k,c+3k,d+4k
III.
,
,
,dk
- A I only
- B I and II only
- C II and III only
- D I and III only
- E I, II, and III