Multiple choice

Find out the wrong number in the following series: 7, 8, 18, 57, 228, 1165, 6996

  1. 8

  2. 18

  3. 57

  4. 228

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: 7*1+1=8, 8*2+2=18, 18*3+3=57, 57*4+4=232. The term 228 is incorrect; it should be 232. Checking the next term: 232*5+5=1165, which is correct.

AI explanation

The logic of the series is based on multiplying by increasing consecutive integers and adding one. The sequence follows 7 times 1 plus 1 equals 8, 8 times 2 plus 2 equals 18, and 18 times 3 plus 3 equals 57. Following this method, 57 times 4 plus 4 should be 232, which makes 228 the wrong term.