Question

If A = {1, 3, 5, B} and B = {2, 4}, then
(a) $4\in A$
(b) $\left\{4\right\}\subset A$
(c) $B\subset A$
(d) none of these.

Answer 1

(d) none of these

$4\notin A$
{4} ⊄ A
B⊄ A
Thus, we can say that none of these options satisfy the given relation.