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Recently Referred Formulae

p_{a-b-}=p_a\frac{p_b}{1-p_a}
p_a,p_b,p_c,p_d\cdots
p_a,p_b,p_c,p\cdots
p_a,p_b,p_c,\cdots
p_{[a-b]}=p_a\frac{p_b}{1-p_a}+p_b\frac{p_a}{1-p_b}