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The 1st, 4th and 8th terms of an arithmetic progression with non-zero common difference are in geometric progression. The common ratio of that geometric progression is:

Competition practiceAlgebra
  • A3/4
  • B4/3
  • C3/2
  • D2

Step-by-Step Solution

With first term a and common difference the three terms are a, and . The geometric condition gives , so and (as ≠ 0) . The terms are 9, whose common ratio is .
Answer: B) 4/3

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