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A Chinese couple walk past Christmas decorated trees on display in... News PhotoBeijing,China - East Asia,Christmas,Christmas Tree,Couple - Relationship,Horizontal,Religion,Tree,WalkingPhotographer Collection: AFP 2012 AFPA Chinese couple walk past Christmas decorated trees on display in Beijing on December 10, 2012. Mathematics has provided an answer for those striving for the perfect Christmas tree, Britain's University of Sheffield says after being set the challenge of decorating a tree so that greenery and glitz are in harmonious proportion. Their formula states a 180cm (six-feet) Christmas tree would need 37 baubles, around 919 cms of tinsel (30 feet) and 565 cms (19 feet) of lights, and an 18cm (seven-inch) star or angel to achieve the perfect look. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)