In the following number series only one number is wrong. Find out the wrong number.
1, 3, 10, 21, 64, 129, 356, 7771
21
2
129
3
10
4
356
5
None of these
In the following number series only one number is wrong. Find out the wrong number.
1, 3, 10, 21, 64, 129, 356, 777