Multiple choice

Find the wrong number from the given series. 68 135 222 350 520

  1. 135

  2. 350

  3. 520

  4. 222
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is n^3 + n for consecutive integers: 4^3 + 4 = 64 + 4 = 68 (correct), 5^3 + 5 = 125 + 5 = 130, but the series shows 135 (wrong), 6^3 + 6 = 216 + 6 = 222 (correct), 7^3 + 7 = 343 + 7 = 350 (correct), 8^3 + 8 = 512 + 8 = 520 (correct). The number 135 breaks the pattern and should be 130.

Keep practicing — related questions