Multiple choice

In the following number series only one number is wrong. Find out the wrong number and predict the correct number from the given series. 543, 577, 627, 696, 791

  1. 577

  2. 798

  3. 627

  4. 543

  5. 696
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C Correct answer
Explanation

Analyze the number series: 543, 577, 627, 696, 791. Calculate differences: 577-543=34, 627-577=50, 696-627=69, 791-696=95. The differences are 34, 50, 69, 95. Second differences: 50-34=16, 69-50=19, 95-69=26. The pattern 16, 19, 26 is inconsistent. If 627 were 626, the differences would be 34, 49, 70, 95, giving second differences of 15, 21, 25 - still irregular but 627 breaks the expected pattern more noticeably.

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