Explanation
1. First Sub-series (taking 1st, 3rd, 5th, 7th, 9th terms): The terms are: 8,11,14,17,?
2. Second Sub-series (taking 2nd, 4th, 6th, 8th terms): The terms are: 7,12,17,22
The pattern in the first sub-series shows an increment of 3 for each step. Since the missing number is the 9th term in the overall sequence, it corresponds to the next step in the first sub-series.
Calculation: 17+3=20
Final Answer
The missing number is 20.
The correct option is B.
