The nth term of the sequence 1, 2, 4, 7, 11 …. is …………………
A. n3 + 3n2 + 2n
B. n3 – 3n2 + 3n
C. n\(\frac{(n+1)(n+2)}{3}\)
D. \(\frac { n^{ 2 }-n+2 }{ 2 } \)
Answer:D
The nth term of the sequence 1, 2, 4, 7, 11 …. is …………………
A. n3 + 3n2 + 2n B. n3 – 3n2 + 3n C. n\(\frac{(n+1)(n+2)}{3}\) D. \(\frac { n^{ 2 }-n+2 }{ 2 } \)