Preface 3
이 책의 특징 4

TOPIC 1 Beginning with Combinatorics 9

1.1 Multiplication and Addition Principle................. 10
1.2 Principle of Inclusion and Exclusion.................. 12
1.3 Practices.............................................................. 13

TOPIC 2 Continuing with Combinatorics 31

2.1 Case enumeration and Complements................. 32
2.2 Indistinguishables and Distinguishables............ 34

TOPIC 3 Ending with Combinatorics 53

3.1 Probability with restrictions............................... 54
3.2 Combinatorial Probability................................... 56
3.3 Practices ............................................................. 57

TOPIC 4 Beginning with Number Theory 79

4.1 Divisor and Remainders...................................... 80
4.2 Parity and Modular Arithmetic............................ 82
4.3 Practices ............................................................. 83

TOPIC 5 Ending with Number Theory 99

5.1 Divisibility and Modular Arithmetic................... 100
5.2 Chinese Remainder Theorem.............................. 102
5.3 Base Expression and Modular Expression......... 103
5.4 Practices ............................................................. 104

TOPIC 6 Beginning with Geometry 121

6.1 Basic Guidelines for Plane Geometry Problems.122
6.2 Angle Bisector and Perpendicular Bisector........ 123
6.3 Practices ............................................................. 124

TOPIC 7 Ending with Geometry 137

7.1 Quadrilaterals and Cyclic Quadrilaterals............ 138
7.2 Circles ................................................................ 139
7.3 Practices ............................................................. 140