You were accepted by Carnegie-Mellon University? Wellllll, no, you weren't. Sorry.
As reported in the Pittsburgh Post-Gazette, Carnegie-Mellon University mistakenly sent 800 acceptance (http://www.post-gazette.com/news/education/2015/02/19/Is-there-a-legal-case-for-students-spurned-by-Carnegie-Mellon/stories/201502190127) letters for its Master of Science in Computer Science program.
They're not saying it's a "computer error," but what are the other explanations? High irony all around. The program accepts fewer than nine percent of more than 1,200 applicants, which places the acceptance level at about a hundred, so they're bad at math, too.