\left( {\rm E}\left[ \sum_{i=1}^N {\cal R}_i \right] \right)^2 &=& (\mu^N \mu^{N-1} \cdots \mu)^2 \\ &=& \left( \sum_{i=1}^N \mu^i \right)^2
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  1. http://formula.s21g.com/