Multiple choice

Find the wrong number in the following number series. 489, 412, 346, 291, 245, 214, 192, 181

  1. 291

  2. 245

  3. 214

  4. 192

  5. 181
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B Correct answer
Explanation

The differences between consecutive terms are: 489-412=77, 412-346=66, 346-291=55, 291-245=46, 245-214=31, 214-192=22, 192-181=11. The pattern of differences should be 77, 66, 55, 44, 33, 22, 11. 245 is incorrect because 291-44=247, and 247-33=214.

AI explanation

The differences between the consecutive terms are 77, 66, 55, 46, 31, 22, and 11. The pattern of differences should decrease by 11 each time, meaning the fourth difference should be 44. Subtracting 44 from 291 gives 247, which shows that 245 is the wrong number.

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