1 | ||
[
|
1 | ||
[
|
1 | ||
[
|
A.0 | B.1 | C.2 | D.3 |
[n(n+1)-1]2 |
n(n+1) |
1 |
n(n+1) |
1 |
(n-1)(n+2) |
1 |
3 |
1 |
n-1 |
1 |
n+2 |
1 |
9 |
1 |
12 |
1 |
10 |
1 |
13 |
1 |
11 |
1 |
14 |
1 |
12 |
1 |
15 |
1 |
48 |
1 |
51 |
1 |
9 |
1 |
10 |
1 |
11 |
1 |
49 |
1 |
50 |
1 |
51 |
20 |
3 |
1 |
9 |
1 |
10 |
1 |
11 |
1 |
49 |
1 |
50 |
1 |
51 |
1 |
2 |
A.-
| B.-
| C.-2 | D.-4 |
A.只有一种 | B.恰有两种 | C.多于三种 | D.不存在 |
A.1 | B.2 | C.3 | D.4 |
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