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How to Prove It: A Structured Approach by Velleman

Applied Combinatorics by Alan Tucker (2006, Hardcover)

SET THEORY HAUSDORFF 1962 HB VINTAGE MATHEMATICS 3rd Edition

Statistical Inference by Roger Berger and George Casella (2001, Hardcover)

Mathematics -Topology, Algebra, Logic, Probability, Statistics. Lot of 11 books.

Elementary Number Theory by Kenneth Rosen (2010, Hardcover)

Mathematical Statistics with Applications by Wackerly