Multiple choice

Find out the wrong number in the series 4, 11, 30, 61, 128, 219, 346

  1. 61

  2. 30

  3. 128

  4. 219
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is n³ + 3: 1³+3=4, 2³+3=11, 3³+3=30, 4³+3=67 (but 61 is given), 5³+3=128, 6³+3=219, 7³+3=346. The number 61 breaks the pattern as 4³+3=67, not 61. Alternatively, checking n³+n+1: 1+1+1=3≠4. The pattern 3, 11, 30, 67, 128, 219, 346 is n³+3, making 61 the wrong number.

Keep practicing — related questions