Which of these famous publishing houses was formed through the 2013 merger of Penguin Books and Random House, creating the world's largest book publisher?

The publishing industry has seen numerous mergers and acquisitions that have reshaped the literary landscape. Major publishing houses have complex histories of consolidation that continue to influence which books reach readers. Test your knowledge of publishing industry history and how today's literary giants came to be through strategic brand mergers and acquisitions.

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Penguin Random House
HarperCollins Publishers
Simon & Schuster Macmillan
Hachette Book Group