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      Question

      What value should come in the place of (?) in the

      following number series? 500, 789, 428, ?, 340, 965
      A 720 Correct Answer Incorrect Answer
      B 869 Correct Answer Incorrect Answer
      C 724 Correct Answer Incorrect Answer
      D 932 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, 500 + 17² = 500 + 289 = 789 789 – 19² = 789 – 361 = 428 428 + 21² = 428 + 441 = 869 869 – 23² = 869 – 529 = 340 340 + 25² = 340 + 625 = 965 So the pattern is: +17², –19², +21², –23², +25². Hence 869 will come in place of (?)

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