Version of 8 January 2016
Introduction to permutations and determinants essentially complete and self-contained. Some basic material on binomial coefficients and recurrent sequences. Some 40 exercises with solutions, and some 20 more exercises without.
This is a frozen version of 8 January 2016, archived here so that it can be referenced. The version on http://web.mit.edu/~darij/www/index.html (and in the actual repository) will probably see some updates.