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Recently Referred Formulae

\sum_{n\neq k}\sum_{m\neq n} p_n\frac{p_a}{1-p_n}+
\sum_{n\neq k}\sum_{m\neq n,} p_n\frac{p_a}{1-p_n}+
\sum_{n\neq k}\sum_{m\neq } p_n\frac{p_a}{1-p_n}+
\sum_{n\neq k}\sum_{m\neq a} p_n\frac{p_a}{1-p_n}+
\sum_{n\neq k}\sum_{n\neq a} p_n\frac{p_a}{1-p_n}+