1, 9, 125, 49, 729, 121, 2147
May be this question is to identify the wrong number in the series...
This is an alternate series of ^3 and ^2
1 : 1^3
9 : 3^2
125 : 5^3
49 : 7^2
729 : 9^3
121 : 11^2
2197 : 13^3
So, the wrong number is: 2147
Option: 1