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p\sum_{n\neq a} p_n \frac{p_a}{1-p_n}
\sum_{n\neq a} p_n \frac{p_a}{1-p_n}
p_{[a-*]}=p_a\sum_{n\neq a} p_n \frac{p_a}{1-p_n}
p_{[a-*]}=p_a+\sum_{n\neq a} p_n \frac{p_a}{1-p_n} \
p_{[a-*]}=p_a+\left(1\sum_{n\neq a} p_n \frac{p_a}{1-p_n} \right)