n(n+1) |
2 |
an |
2n |
n(n+1) |
2 |
(n-1)n |
2 |
1 |
2 |
2 |
22 |
3 |
23 |
n |
2n |
1 |
2 |
1 |
22 |
2 |
23 |
3 |
24 |
n |
2n+1 |
1 |
2 |
1 |
2 |
1 |
22 |
1 |
23 |
1 |
2n |
n |
2n+1 |
1 |
2n |
n |
2n+1 |
n+2 |
2n |
n+1 |
2n+1 |
1 |
2 |
n+2 |
2n |
1 |
2 |
1 |
an |
1 |
2 |
1 |
anan+1 |
a | 2n |
1 |
2 |
1 |
16 |
n+n2 |
2k-1 |
1 |
anan+1 |
A.
| B.
| C.
| D.
|
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