correct both times.
In general, for a given set of problems, U is the Universe. Any subsets being discussed will always be subsets of U, or things are poorly set up.
U = 1,2,3,4,5,6,7,8,9
A = 1,3,5,7
B = 4,5,6
a ⊂ b True or false
and
B ⊂ U True or false
My answers are false for the first one and true for the second one
1 answer
2 answers