Which product launch in literary history broke first-day sales records by selling 1.3 million digital copies in addition to 8.3 million hardcover copies within 24 hours of its release?

The publishing industry has seen numerous innovative product launches that revolutionized how we consume literature. From groundbreaking e-readers to subscription services that transformed access to books, these product launches represent pivotal moments in literary history. Test your knowledge about these significant product milestones that changed how we read, discover, and engage with literary works.

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J.K. Rowling's 'Harry Potter and the Deathly Hallows' (2007)
Dan Brown's 'The Lost Symbol' (2009)
George R.R. Martin's 'A Dance with Dragons' (2011)
E.L. James' 'Fifty Shades of Grey' (2011)