Which two major mathematical textbook publishers merged in 2007 to create what was then the largest educational publishing company in the world?

The world of mathematical textbooks and educational resources is dominated by several key publishing companies. Over the decades, these companies have evolved through various mergers and acquisitions, reshaping how mathematical knowledge is distributed to students and professionals worldwide. Test your knowledge about one of the most significant mergers in the mathematical publishing industry!

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Houghton Mifflin and Harcourt
McGraw-Hill and Pearson
Wiley and Springer
Cambridge University Press and Oxford University Press