a1 + an | ||
Sn = | * n | |
2 |
a1 + an | ||
S2n = | * 2n | |
2 |
a1 + an | ||
S3n = | * 3n | |
2 |
a1 + an | a1 + an | |||
3(S2n − Sn) = 3(2n * | − n * | ) = | ||
2 | 2 |
n(a1 + an) | a1 + an | |||
3( | ) = 3n * | |||
2 | 2 |
5^2 | 52 |
2^{10} | 210 |
a_2 | a2 |
a_{25} | a25 |
p{2} | √2 |
p{81} | √81 |
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