Coursera Inc., a leading player in the competitive online education market, has secured a fresh $103 million round of funding to expand its learning platform. The startup announced the investment this morning, roughly two years after its previous $64 million raise. Coursera said the total number of people who have taken lessons on its platform jumped from 26 million to 40 million in the period between the rounds. The San Francisco-based startup offers more than 3,200 online courses that span topics as diverse as medicine and software development. They also vary greatly in depth.