{\rm V}[R_1 R_2 \cdots R_N] &=& {\rm E}[R_1^2 R_2^2 \cdots R_N^2] - ({\rm E}[R_1 R_2 \cdots R_N])^2 \\ &=& {\rm E}[R_1^2] \cdots {\rm E}[R_N^2] - \mu^{2N}
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