1 |
12 |
1 |
22 |
1 |
32 |
1 |
n2 |
A.0 | B.1 | C.2 | D.3 |
1 |
12 |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
1×2 |
1 |
2×3 |
1 |
(n-1)n |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n-1 |
1 |
n |
1 |
n |
1 |
n |
1 |
12 |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
n(n+1) |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
1 |
12 |
1 |
22 |
1 |
32 |
1 |
n2 |
1 |
2 |
1 |
2 |
an+1 |
an |
ak+1 |
ak |
1 |
1+a1 |
1 |
(1+a1)(1+a2) |
1 |
(1+a1)(1+a2)…(1+an) |
A.11 | B.8 | C.6 | D.5 |
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