This is a crucial consideration before you commit to finding a digital copy.
Biggs’ book works because it is short and cheap (used). If you are teaching a one-semester discrete math course, assign Biggs over the $200 behemoths. Then, place a copy of the first three chapters as a PDF on your university’s secure course website (allowed under fair use for enrolled students). This single act will stop the desperate, dangerous web searches. discrete mathematics by norman biggs pdf