Final answer:
The 1983 movie that combined the plots of Mark Twain's "The Prince and the Pauper" and "The Million Pound Note" is called "Trading Places".
Step-by-step explanation:
The 1983 movie that combined the plots of Mark Twain's "The Prince and the Pauper" and "The Million Pound Note" is called "Trading Places". While the movie is not a direct adaptation of the two stories, it incorporates similar themes of mistaken identity and social experimentation. In "Trading Places", two men from different social backgrounds switch lives as part of a social experiment by two wealthy brothers. The movie modernizes the concept of the prince and pauper tale and adds its own unique elements to create a comedy film.