Question

fins wrong term

89,78,86,80,85,82,82,83

Answer 1

The wrong number is 86.

Explanation:

Take even place numbers:
78, 80, 82

78 - 80 = 2
80 - 82 = 2

Take odd place numbers:
89, 86, 85, 83

89 - 86 = 3
86 - 85 = 1 
85 - 83 = 2

If we change the number 87 instead of 86 we will get the difference are 2, 2, 2.


So, the odd man out is 86.