Multiple choice

In the following number series a term is wrong. Find the wrong term. 2198 1330 730 324 126 63

  1. 324

  2. 126

  3. 1330

  4. 730

  5. 63
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A Correct answer
Explanation

Pattern: -12³-1, -11³-1, -10³-1, -9³-1, -8³-1. 2198-1728-1=469, but we have 1330. 1330-1331-1=-2, but we have 730. The pattern is actually: subtract 1, then multiply by 8; subtract 1, multiply by 9; etc. 126×8-1=1007, not 63. The term 324 is wrong.

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