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      Question

      351      261      181      111      51   

        ? What will come in place of the question mark (?) in the following series?
      A 1 Correct Answer Incorrect Answer
      B 11 Correct Answer Incorrect Answer
      C 21 Correct Answer Incorrect Answer
      D 31 Correct Answer Incorrect Answer

      Solution

      351 – 90 = 261 261 – 80 = 181 181 – 70 = 111 111 – 60 = 51 51 – 50 = 1

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