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3, 7, 15, 39, 63, 127, 255, 511

  • A.39
  • B.15
  • C.7
  • D.63
  • E.127

Answer: A

Correct answer: 39

Each term should be one less than a power of two: 3, 7, 15, 31, 63, 127, 255, 511. The fourth term is given as 39 where it should be 31, so that is the wrong one.

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