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 | ★★☆ | [Introduction to Probability](http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/book.html), by Charles M. Grinstead, J. Laurie Snell | This is a well-written introductory probabilities book. ... It's free for [download (pdf)](http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/amsbook.mac.pdf) (released under GNU Free Documentation License). |
 | ★★☆ | [How to Solve It: A New Aspect of Mathematical Method](https://www.amazon.com/How-Solve-It-Mathematical-Princeton/dp/069111966X), by G. Polya | An old-time classic. In this book, the author provides a systematic way to solve problems creatively. |
 | ★★☆ | [Intermediate Counting & Probability](https://artofproblemsolving.com/store/item/intermediate-counting), by David Patrick | Topics in counting and probability byformer USA Mathematical Olympiad winner David Patrick , topics  include inclusion-exclusion, 1-1 correspondences, the Pigeonhole Principle, constructive expectation, Fibonacci and Catalan numbers, recursion, conditional probability, generating functions, graph theory, and much more.. |
+| ★★☆ | [A Passion for Mathematics - Numbers, Puzzles, Madness, Religion, and the Quest for Reality](https://pdfhost.io/v/TWr7I2RjA_A_Passion_for_Mathematics_Numbers_Puzzles_Madness_Religion_and_the_Quest_for_Reality_by_Clifford_A_Pickover_zliborg), by Clifford A. Pickover | This book is meant to be a textbook for an introductory combinatorics course that can take one or two semesters. It covers the classics, that is, combinato-rial choice problems, and graph theory. A must-read book to excel in CP. |
 
 
 ## Sites for Practice