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      Question

      1        1        4         ? 

            280         3640 What should come in place of question mark ‘?’ in the following number series?
      A 28 Correct Answer Incorrect Answer
      B 74 Correct Answer Incorrect Answer
      C 40 Correct Answer Incorrect Answer
      D 92 Correct Answer Incorrect Answer

      Solution

      1 × 1 = 1 1 × 4 = 4 4 × 7 =  28 28 × 10 = 280 280 × 13 = 3640

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