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man111
30-11-2010, 07:28 AM
[Only registered and activated users can see links]$Q:$\Rightarrow$%20There%20are%204%20mac hines%20&%20it%20is%20known%20that%20exactly%202%20of%20the m%20are%20faulty.%20They%20are%20tested,%20one%20b y%20one,%20in%20a%20random%20order%20till%20both%2 0the%20faulty%20machines%20are%20identified%20.%20 Then%20the%20probability%20that%20only%202%20tests %20are%20needed%20is:\\\\%20(A)%201/3%20(B)%201/6%20(C)%201/2%20(D)%201/4

thuynt
07-12-2010, 06:14 PM
[QUOTE=man111;72795][Only registered and activated users can see links]$Q:$\Rightarrow$%20There%20are%204%20mac hines%20&%20it%20is%20known%20that%20exactly%202%20of%20the m%20are%20faulty.%20They%20are%20tested,%20one%20b y%20one,%20in%20a%20random%20order%20till%20both%2 0the%20faulty%20machines%20are%20identified%20.%20 Then%20the%20probability%20that%20only%202%20tests %20are%20needed%20is:\\\\%20(A)%201/3%20(B)%201/6%20(C)%201/2%20(D)%201/4[/QUOTE
dap an la B