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      Question

      42, 85, 172, 343, 687,

      1375 Find out the wrong number in the given number series.
      A 42 Correct Answer Incorrect Answer
      B 172 Correct Answer Incorrect Answer
      C 85 Correct Answer Incorrect Answer
      D 1375 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, 42 X 2 + 1 = 85 85 X 2 + 1 = 171 171 X 2 + 1 = 343 343 X 2 + 1 = 687 687 X 2 + 1 = 1375 Therefore, 171 will come in place of 172.

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