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hieuluoibieng
2 năm trước
Mỗi đỉnh của một tấm bìa hình tam giác được đánh số lần lượt là 1; 2; 3. Người ta chồng các tam giác này lên nhau sao cho không có chữ số nào bị che lấp. Một bạn cộng tất cả các chữ số nhìn thấy thì được kết quả là 2002. Liệu bạn đó có tính nhầm không?
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