Multiple choice

Find the wrong number in the following number series. 675, 627, 580, 542, 509, 485, 472

  1. 627

  2. 485

  3. 580

  4. 542

  5. 675
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C Correct answer
Explanation

Analyze the differences: 675-627=48, 627-580=47, 580-542=38, 542-509=33, 509-485=24, 485-472=13. The pattern should be subtracting decreasing numbers (48, 47, 46, 45...). The difference 580-542=38 breaks this pattern - it should be 580-534=46. If 580 were 534, the pattern would work. Thus 580 is the wrong number.

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