What is the n-th term of the sequence 2, 6, 12, 20...?
MATHEMATICS
JAMB 1992
What is the n-th term of the sequence 2, 6, 12, 20...?
- A. 4n - 2
- B. 2(3n - 1)
- C. n2 + n
- D. n2 + 3n + 2
Correct Answer: C. n2 + n
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