Question:
If A = {1, 3, 5, B} and B = {2, 4}, then
(a) $4 \in A$
(b) $\{4\} \subset A$
(c) $B \subset A$
(d) none of these.
Solution:
(d) none of these
$4 \notin A$
$\{4\} \not \subset A$
$B \not \subset A$
Thus, we can say that none of these options satisfy the given relation.