To follow up:
a) [MATH]12\in A[/MATH]
We see that 12 in deed listed as an element of set
A, so this is true.
b) [MATH]14\not\in B[/MATH]
We see that 14 is not given as an element of set
B, so this is true.
c) [MATH]14\not\in B[/MATH]
We see that 13 is given as an element of set
B, so this is false.
d) [MATH]\{10,16\}\subset A[/MATH]
We see that both 10 and 16 are elements of set
A and that set
A has elements other than these two, and so this is true.
e) [MATH]A\not\subset B[/MATH]
We see that there are elements in set
A that are not in set
B, and so this is true.
f) [MATH]B\subset A[/MATH]
We see that all elements of set
B are also in set
A and that there are elements in set
A that are not in set
B and so this is true.