Correct option is A
Given: 16, 21, ?, 43, 60, 81, 106
Step-by-Step Calculation Using the Differences:
Start with 16.
16 + 5 = 21
21 + 9 = 30 (this is the missing term)
30 + 13 = 43
43 + 17 = 60
60 + 21 = 81
81 + 25 = 106
The complete series is: 16, 21, 30, 43, 60, 81, 106
Correct Answer: (a) 30