{\rm E}[X_n^{(1)}] &=& (1-\lambda)X_0   \lambda {\rm E}[R_1] \cdots {\rm E}[R_N] X_0 \\
 &=& (1-\lambda)X_0   \lambda \mu^N X_0
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Recent Referers:
  1. http://formula.s21g.com/