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Is there some sort of online database for looking up questions and answers?
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im at uni and we have a new math course, I can't find a reasonable amount of questions in the subject (found only around 20 questions mostly from practice problems) in my language.
the subject is combinatorics and talks specifically about
- set theory
- functions (subjective, injective, etc...)
- induction and recursion
- permutations and counting problems (addition and multiplication principles)
- the choosing of k out of n and its applications to counting problems
- the binomial coeffiecent
- inclusion-exclusion principle and its applications
- fixed point of permutations
- the pigeon hole principle and its applications
- recursive solutions to counting problems and how to find closed-form expressions
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