a1+a2…+an |
b1+b2+…bn |
2n+1 |
n+3 |
a3 |
b3 |
A.
| B.
| C.
| D.
|
a3 |
b3 |
2a3 |
2b3 |
a1+a5 |
b1+b5 |
| ||
|
a1+a2…+a5 |
b1+b2+…b5 |
11 |
8 |
A.2 | B.
| C.
| D.
|
A.S20 | B.S21 | C.S10 | D.S11 |
A.5 | B.10 | C.12 | D.15 |
1 |
2 |
1 |
4 |
1 |
8 |
1 |
16 |
1 |
2n |
A.n2+1-
| B.2n2-n+1-
| ||||
C.n2+1-
| D.n2-n+1-
|
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