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      Question

      Select the number from among the given options that can

      replace the question mark (?) in the following series. 7, 9, 15, 49, 191, ?, 5759.
      A 945 Correct Answer Incorrect Answer
      B 961 Correct Answer Incorrect Answer
      C 992 Correct Answer Incorrect Answer
      D 921 Correct Answer Incorrect Answer

      Solution

      The logic is: 7 Γ— 1 + 2 = 9 9 Γ— 2 – 3 = 15 15 Γ— 3 + 4 = 49 49 Γ— 4 – 5 = 191 191 Γ— 5 + 6 = 961 961 Γ— 6 – 7 = 5759 So, the missing number is β€˜721’

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