What should come in place of the question mark (?) in the given series?
305 251 206 170 143 ?
-
A.
130
-
B.
125
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C.
120
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D.
115
Correct Answer:
B. 125
Explanation:
The correct answer is Option B: 125.
The series follows a pattern of decreasing differences between consecutive numbers. By calculating the differences, we see: - 305 - 251 = 54
- 251 - 206 = 45
- 206 - 170 = 36
- 170 - 143 = 27The differences (54, 45, 36, 27) are all multiples of 9, decreasing by 9 each time. Following this logic, the next difference should be 27 - 9 = 18. To find the missing number, subtract 18 from the last term: 143 - 18 = 125.
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