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Xác suất theo hình học
Chọn ngẫu nhiên [math]M(x,y)[/math] thỏa mãn [math]x,y\in[0,1][/math].[br][br]Tính xác suất để chọn điểm thỏa mãn [math]x+y\leq 1[/math]?[br]