1 |
n(n+1) |
1 |
n(n+1) |
1 |
n |
1 |
n+1 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
3 |
4 |
n |
n+1 |
1 |
2 |
1 |
2 |
1 |
anan+1 |
A.
| B.
| C.
| D.
|
| ||
1-x |
1 |
2 |
OP |
OM |
ON |
1 |
n |
2 |
n |
n-1 |
n |
|
1 |
22-1 |
1 |
32-1 |
1 |
42-1 |
1 |
(n+1)2-1 |
A.
| B.
| ||||||||||||||
C.
| D.
|
AnAn+1 |
j |
j |
1 |
2 |
1 |
22 |
1 |
2n-1 |
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