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The Quest for 700: Weekly GMAT Challenge

Each week Manhattan GMAT posts a GMAT question on our blog and follows up with the answer the next day. Are you up for the challenge?

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. ak4, bk3, ck2, dk

(A) I only

(B) I and II only

(C) II and III only

(D) I and III only

(E) I, II, and III




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