Dùng cá cảnh để chọn người trúng thưởng
Cá cảnh. Ảnh minh họaDave Mackie, doanh nhân 49 tuổi ở Lancashire (Anh) đã tổ chức một cuộc thi giải ô số Sudoku trực tuyến. Phần thưởng cho người thắng giải là một ngôi nhà sang trọng trị giá 675.000 bảng. Cuộc thi dự tính kéo dài đến 1/2/2010 nhưng cũng có thể kết thúc sớm hơn nếu Mackie đã nhận được 14.000 bài giải.
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