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Party A and Party B participate in the recruitment of a foreign trade company.

1、P = 1/2+( 1- 1/2)× 1/3+( 1- 1/2)( 1- 1/3)× 1/4 = 3/4

2. At most one person signs the contract, that is to say, A is qualified, B and C are unqualified or all three are unqualified.

So p =1/2× (1-kloc-0//3) (1-kloc-0//4)+(1-kloc-0//2) (/kloc)