Sn |
n |
1 |
2 |
4 |
15 |
Sn |
n |
1 |
2 |
n |
2 |
4 |
15 |
4 |
15 |
4 |
15 |
4 |
15 |
4 |
15 |
4 |
15 |
4 |
15 |
4 |
15 |
4 |
15 |
4k |
5 |
dk+1 |
dk |
|
4k+1 |
5 |
(5-1)k+1 |
5 |
C | 1k+1 |
C | 2k+1 |
C | kk+1 |
1 |
5 |
1 |
5 |
1 |
5 |
3 |
5 |
3(4k+1) |
5 |
3•(4k-1) |
5 |
an+1 |
an |
an |
an+1 |
1 | ||
|
1 |
4 |
1 |
2 |
a3+a4 |
a4+a5 |
A.
| B.
| C.
| D.
|
A.4 | B.5 | C.6 | D.7 |
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