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      Question

      Select the number from among the given options that can

      replace the question mark β€˜?’ in the following series. 21, 25, 33, 49, β€˜?’, 145
      A 81 Correct Answer Incorrect Answer
      B 89 Correct Answer Incorrect Answer
      C 87 Correct Answer Incorrect Answer
      D 82 Correct Answer Incorrect Answer

      Solution

      21 + 4 = 25 25 + 8 = 33 33 + 16 = 49 49 + 32 = 81 81 + 64 = 145

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