题目列表(包括答案和解析)
| C | 0 n |
| C | 1 n |
| C | 2 n |
| C | n n |
| C | 2 n |
| C | 3 n |
| C | 4 n |
| C | n n |
| C | 1 n |
| C | 2 n |
| C | 3 n |
| C | n n |
| C | 2 n |
| C | 3 n |
| C | 4 n |
| C | n n |
| n(n+1) |
| 2 |
| n(n+1)(2n+1) |
| 6 |
| C | 0n |
| C | 1n |
| C | 2n |
| C | nn |
| C | 2n |
| C | 3n |
| C | 4n |
| C | nn |
| C | 1n |
| C | 2n |
| C | 3n |
| C | nn |
| C | 2n |
| C | 3n |
| C | 4n |
| C | nn |
|
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