Select the number from among the given options that can replace the question…
2022
Select the number from among the given options that can replace the question mark (?) in the following series.
9, 25, 67, 121, ?
Answer: B. 221 — The series follows the pattern: n^3 + adjustment, where the adjustment alternates in sign and increments by 1. 2^3 + 1 = 8 + 1 = 9 3^3 - 2 = 27 - 2 = 25 4^3 +…
- A.
220
- B.
221
- C.
218
- D.
219
Attempted by 91 students.
Show answer & explanation
Correct answer: B
The series follows the pattern: n^3 + adjustment, where the adjustment alternates in sign and increments by 1.
2^3 + 1 = 8 + 1 = 9
3^3 - 2 = 27 - 2 = 25
4^3 + 3 = 64 + 3 = 67
5^3 - 4 = 125 - 4 = 121
6^3 + 5 = 216 + 5 = 221
Final Answer: Option 2
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