Find the wrong term in the series: 1, 6, 11, 22, 33, 46, 61
Find the wrong term in the series: 1, 6, 11, 22, 33, 46, 61
The gaps between terms come in equal pairs that increase by 6 each time: +5,+5 then +11,+11 then +15,+15. Following this, after 33 the next term should be 33+15=48, not 46. So 46 is the wrong term (it should be 48).
Re-check your working by substituting the answer back into the original question.