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      Question

      Which of the following numbers will replace the question

      mark (?) In the given series? 21, ?, 30, 39, 51, 66
      A 26 Correct Answer Incorrect Answer
      B 23 Correct Answer Incorrect Answer
      C 25 Correct Answer Incorrect Answer
      D 24 Correct Answer Incorrect Answer

      Solution

      21 + 3 = 24 24 + 6 = 30 30 + 9 = 39 39 + 12 = 51 51 + 15 = 66

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