Find the missing term: 1, 3, 1, 9, 1, ?
Find the missing term: 1, 3, 1, 9, 1, ?
The numbers at odd positions are always 1. The numbers at even positions follow a squaring pattern: 3, then 3 squared = 9, then 9 squared = 81. So the missing term is 81.
Re-check your working by substituting the answer back into the original question.