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      Question

      What should come in place of '?' in the given

      series? 5   15   35   75   155  ?
      A 315 Correct Answer Incorrect Answer
      B 305 Correct Answer Incorrect Answer
      C 325 Correct Answer Incorrect Answer
      D 335 Correct Answer Incorrect Answer

      Solution

      5 + 10 = 15 15 + 20 = 35 35 + 40 = 75 75 + 80 = 155 155 + 160 = 315

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