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p_=
p_{a-b}=p_a
p_{[a-b-c]}=p_afrac{p_b}{1-p_a}frac{p_c}{1-p_a-p_b}+p_afrac{p_c}{1-p_a}frac{p_b}{1-p_a-p_c}+p_bfrac{p_a}{1-p_b}frac{p_c}{1-p_a-p_b}
;;;;;+p_bfrac{p_c}{1-p_b}frac{p_a}{1-p_b-p_c}+p_cfrac{p_a}{1-p_c}frac{p_b}{1-p_a-p_c}+p_cfrac{p_b}{1-p_c}frac{p_a}{1-p_b-p_c}
p_{a-b-c}=p_afrac{p_b}{1-p_a}frac{p_c}{1-p_a-p_b}