Multiple choice

In the following series, only one number is wrong. Find out the wrong number. 122, 465, 681, 806, 833, 897, 905

  1. 833

  2. 905

  3. 465

  4. 806

  5. 897
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A Correct answer
AI explanation

The pattern in this series involves adding consecutive multiples of the decreasing difference between terms, specifically differences of 343, 216, 125, 64, 27, and 8. These differences are the cubes of 7, 6, 5, 4, 3, and 2 respectively. Adding 64 to 806 gives 870, and adding 27 to 870 correctly results in 897, proving 833 is the incorrect number.

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