Multiple choice

Find the wrong term in the following number series: 15 38 84 153 245 365

  1. 84

  2. 365

  3. 15

  4. 153

  5. 245
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B Correct answer
Explanation

The pattern: 15+23=38, 38+46=84, 84+69=153, 153+92=245, 245+115=360≠365. The additions are 23, 46, 69, 92, 115 - which is 23×1, 23×2, 23×3, 23×4, 23×5. After 245, adding 23×5=115 gives 360, not 365. So 365 is the wrong term.

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