Find the odd man out. 2, 3, 5, 9, 12, 17, 23
12
9
23
2
Explanation:
2 + 1 = 3
3 + 2 = 5
5 + 3 = 8
8 + 4 = 12
12 + 5 = 17
17 + 6 = 23
ie, 8 should have come in place of 9