Multiple choice

Directions: Find the wrong term in the following series. 13, 27, 58, 125, 271, 557, 1150

  1. 27

  2. 58

  3. 125

  4. 271

  5. 552
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is x * 2 + 1, x * 2 + 4, x * 2 + 9, x * 2 + 16, etc. (adding squares of 1, 2, 3, 4...). 13*2+1=27; 27*2+4=58; 58*2+9=125; 125*2+16=266 (not 271). 266*2+25=557; 557*2+36=1150. Thus, 271 is the wrong term.

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