Which of the following numbers will replace the question mark (?) in the given series?
191, 174, 165, 148, 139, ?
- A125
- B120
- C122
- D128
Solution & Step-by-step Explanation
Let's analyze the difference between consecutive numbers in the series:
191−174=17
174−165=9
165−148=17
148−139=9
The series follows an alternating subtraction pattern of −17 and −9.
Following this logic, the next subtraction should be −17:
139−17=122
191−174=17
174−165=9
165−148=17
148−139=9
The series follows an alternating subtraction pattern of −17 and −9.
Following this logic, the next subtraction should be −17:
139−17=122