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      Question

      7, 78, 324, 900,1855,

      3128 Find the wrong number in the given number series.
      A 7 Correct Answer Incorrect Answer
      B 324 Correct Answer Incorrect Answer
      C 1855 Correct Answer Incorrect Answer
      D 74 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, The series follows the pattern: (2 Γ— 3) + 1 = 7, (7 Γ— 11) + 1 = 78, (17 Γ— 19)+ 1= 324, (29 Γ— 31) + 1 = 900, (41 Γ— 43) + 1 = 1764, (53 Γ— 59) + 1 = 3128

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