\sum\limits_{i=1}^n i^2 = \frac{n(n+1)(2n+1)}{6} 加和公式为
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6
\sum\limits_{i=1}^n i^2 = \frac{n(n+1)(2n+1)}{6}
i=1∑ni2=6n(n+1)(2n+1)
\sum\nolimits_{P_i \in Paths(I)} Probes(P_{i}) 加和公式为
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\sum\nolimits_{P_i \in Paths(I)} Probes(P_{i})
∑Pi∈Paths(I)Probes(Pi)
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