Correct Answer - Option 1 : 0
Considering the above series,
81, 80, 88, 61, 125, ?
The logic of the series can be explained as:
81 – 13 = 80
80 + 23 = 88
88 – 33 = 61
61 + 43 = 125
By observing the pattern, we can write
⇒ 125 – 53 = ?
⇒ ? = 0
∴ The value of ? is 0.