날아보자!

Basics of Sets and Relations #1 A, B 합집합의 개수? {1,2,3,4,5,6,7,8} => 8 Basics of Sets and Relations #2 A, B 교집합의 개수? {2,3,4,5,6} => 5 Basics of Sets and Relations #3 A, B 차집합의 개수? {1} => 1 Basics of Sets and Relations #4 A x B 카테시안 곱으로 나올 수 있는 총 수는? 6 x 7 = 42 Basics of Sets and Relations #5 σ 는 표준편차라고 한다. σ(Number 2 select count(*) from Student where number < 3000; Basics of Sets and Relations #6..