# Talk:Piling-up lemma

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Well, adding several random variables ("piling them up"), what do we get? I just added a 2nd related definition of bias, which shows that "piling up" partial knowledge leads to multiplying the (2nd def) biases. E.g. One (2nd def) bias zero (P(1)=P(0)=1/2) renders everything equidistributed, while adding a (2nd def) bias ${\displaystyle \pm 1}$ P(1) or P(0)=1, does not change the overall bias up to sign DocMJV 22:57, 13 September 2007 (UTC)