설정 A={x|x=2n+1,n*8712°N},B={x|1≤x≤10},C={x|x=3n,n*8712°N},구(A∩B)∩C

설정 A={x|x=2n+1,n*8712°N},B={x|1≤x≤10},C={x|x=3n,n*8712°N},구(A∩B)∩C

집합 A={x|x=2n+1,n*8712°N}={1,3,5,7,9...}
그래서 A∩B={1,3,5,7,9}
집합 C={x|x=3n,n*8712°N}={0,3,6,9,12...}
그러므로(A∩B)∩C={1,3,5,7,9}∩{0,3,6,9,12...}={3,9}
답:(A∩B)∩C{3,9}