Math help... please
this doesn't make any sense to me. these are the examples
set B = (1,2,3,4,5) while set A = (1,2,3) so it's a subset because every element in set A is an element of set B.
set A = (6,7) set B (5,6,7,8)
set A is a proper subset of set B because 5 and 8 are not in set B
WHAT?!?!??! BUT IN THE FIRST EXAMPLE, 4 AND 5 AREN'T IN SET B SO WHY ISN'T A A PROPER SUBSET OF SET B?