Pa=0.15+0.85(1/2Pc) ---(1)
Pb=0.15+0.85Pa ---(2)
Pc=0.15+0.85(Pa+Pb) ---(3)
(1)代(2)
Pb=0.15+0.1275+0.36125Pc ---(4)
(1).(4)代(3)
Pc=0.15+0.85(0.15+0.425Pc)+0.850.15+0.1275+0.36125Pc
=0.513375+0.6683125Pc
0.3316875Pc=0.513375 => Pc=1.5477671
Pb=0.15+0.1275+0.36125*1.5477671=0.83663086 => Pb=0.83663086
Pa=0.15+0.425*0.15477671=0.807801012 => Pa=0.807801012
Pc>>Pb>Pa
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