Correct Answer - Option 2 : 121
Given:
990, 494, 246, 121, 60, 29
Calculation:
The logic follows here is:
990 ÷ 2 - 1 = 495 - 1 = 494
494 ÷ 2 - 1 = 247 - 1 = 246
246 ÷ 2 - 1 = 123 - 1 = 122 ≠ 121
122 ÷ 2 - 1 = 61 - 1 = 60
60 ÷ 2 - 1 = 30 - 1 = 29
There should be 122 instead of 121.
∴ 121 is the wrong term.