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Preface 3 ÀÌ Ã¥ÀÇ Æ¯Â¡ 4 Preface 3ÀÌ Ã¥ÀÇ Æ¯Â¡ 4Topic 1 Beginning with Combinatorics 91.1 Multiplication and Addition Principle...........................101.2 Principle of Inclusion and Exclusion............................121.3 Practices.........................................................................13Topic 2 Continuing with Combinatorics 472.1 Case enumeration and Complements............................482.2 Indistinguishables and Distinguishables.......................502.2.1 Permutation Allowing Repetitions........................502.2.2 Partition of Sets....................................................502.2.3 Combination Allowing Repetitions.......................512.2.4 Partition of Natural Numbers...............................512.3 Practices.........................................................................53Topic 3 Ending with Combinatorics 833.1 Probability with Restrictions.........................................843.2 More about Probability..................................................863.3 Practices.........................................................................88Topic 4 Beginning with Number Theory 1274.1 Divisors and Remainders...............................................1284.2 Parity and Modular Arithmetic......................................1304.3 Practices.........................................................................131Topic 5 Ending with Number Theory 1575.1 Divisibility and Modular Arithmetic..............................1585.2 Chinese Remainder Theorem........................................1605.3 Base Expression and Modular Expression....................1615.4 Practices.........................................................................162Topic 6 Beginning with Geometry 1916.1 Basic Guidelines for Plane Geometry Problems...........1926.2 Angle Bisector and Perpendicular Bisector...................1956.3 Practices.........................................................................196Topic 7 Ending with Geometry 2197.1 Quadrilaterals and Cyclic Quadrilaterals.......................2207.2 Circles............................................................................2217.3 Practices.........................................................................222Topic 8 More About Algebra 2 / Precalculus 2458.1 About Polynomials.........................................................2468.2 Maximum and Minimum...............................................2488.3 Floor Function...............................................................2498.4 Sequence and Series......................................................2508.5 Using Trigonometry for Angle Equations......................2518.6 Complex Plane Geometry and Vectors..........................2528.7 Practices.........................................................................255