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      Question

      Select the number from among the given option that can

      replace the question mark (?) in the following series. 4, 21, 86, 261, 526, ?
      A 531 Correct Answer Incorrect Answer
      B 554 Correct Answer Incorrect Answer
      C 556 Correct Answer Incorrect Answer
      D 591 Correct Answer Incorrect Answer

      Solution

      4 Γ— 5 + 1 = 21 21 Γ— 4 + 2 = 86 86 Γ— 3 + 3 = 261 261 Γ— 2 + 4 = 526 526 Γ— 1 + 5 = 531

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