Which of the following numbers will replace the question mark (?) in the given series?
18, 54, 29, 87, 62, 186, ?
- A174
- B154
- C161
- D156
Solution & Step-by-step Explanation
The series follows an alternating pattern of multiplication and subtraction:
18×3=54
54−25=29
29×3=87
87−25=62
62×3=186
Following the same logic, the next operation should be subtracting 25:
186−25=161
18×3=54
54−25=29
29×3=87
87−25=62
62×3=186
Following the same logic, the next operation should be subtracting 25:
186−25=161