In each of the following number series, the wrong number is given, find out that number.
6.5, 26, 91, 273, 686, 1365
1
91
2
273
3
1365
4
686
5
26
In each of the following number series, the wrong number is given, find out that number.
6.5, 26, 91, 273, 686, 1365