RE: Two-envelope problem

[Phan Anh Son <Phan@pgsm.hu>]

	Cha`o ca? la`ng!

	Tha^'y dde^` ta`i na`y so^i no^? qua' to^i cu~ng muo^'n go'p pha^`n.

	Theo to^i thi` ca^u ho?i la` phong bi` na`o co' nhie^`u tie^`n ho+n,
chu+' kho^ng pha?i 
	cu. the^? la` co' bao nhie^u tie^`n. Theo ca'ch nha^.n ddi.nh a^'y thi`
vie^.c mo+? mo^.t
	phong bi` va` nhi`n tha^'y be^n trong co' 100$ hay 1$ hay 10000$ thi`
kho^ng ddem la.i
	plus info gi`. Giu+~ la.i so^' tie^`n a^'y hay ddo^?i sang phong bi`
kha'c la` tu+o+ng du+o+ng
	nhau.

	Mo^.t chu't ti'nh to'an:

	Xa'c xuo^'t cho.n phong bi` co' so^' tie^`n lo+'n ho+n la` 0.5.
	
	Case1: Giu+~ la.i:
	xa'c xua^'t ddu'ng la` 0.5
	
	Case2: DDo^?i sang phong bi`2:
	Cho.n ddu'ng bu+o+c 1=> cho.n sai bu+o+'c 2 va` ngu+o+.c la.i => xa'c
xua^'t ddu'ng la` 0.5

	Tuy nhie^n ne^'u nhi`n ba(`ng con ma('t cu?a nha` kinh te^' thi` ddo^.
lo+'n cu?a so^' tie^`n la`
	informative, cho ne^n tu`y ti'nh ca'ch mo^~i ngu+o+`i se~ cho.n kha'c
nhau ne^'u so^' tie^`n la`
	10$ hay 1 000 000 $

	Son,