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      Question

      10      11       12        20       24 

           ? What should come in place of the question mark (?) in the following number series?
      A 51 Correct Answer Incorrect Answer
      B 41 Correct Answer Incorrect Answer
      C 61 Correct Answer Incorrect Answer
      D 71 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      10 + 13   =11 11 +12  =12 12 +23 =20 20 +22 =24 24 + 33 = 51

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