QUIZ: Can u Guess Which 1D Single Sold meer Copies? 

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You might run several One Direction fan accounts and know exactly what shade of blue brings out Louis Tomlinson\'s eyes the most, but do you know the cold, hard facts about their sales reach?

Well, we\'ve devised a test that\'ll tell you which of One Direction\'s singles are commercially the most successful in the UK. So, reckon you can guess which tracks won the heart of the public? Well take our quiz below and let us know how you score with a tweet @sugarscape. 

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