00:01
So to begin here, i'll just remind that if we have a subset of a particular set, that means that if we say that a is a subset of b, then that implies that the things that are in common between a and b is not an empty set, but the things that are in a that are not in b is an empty set.
00:32
There is nothing in a that is not in b.
00:36
If we have a proper subset, then that means that a is a subset of b and a is not equal to b.
00:55
So b is technically a subset of itself, but b is not a proper subset of itself.
01:02
So to begin, we know that we have the particular set, i'll just call it our super set, so we'll call it omega here, is the set where x is an odd whole number less than nine.
01:15
So the different odd whole numbers less than nine would be one, three, five, and seven.
01:24
Then, for part a, we're asked for the number of possible subsets.
01:31
So we'd have that the number of possible subsets would be equal to the number of subsets of size...