Question

Let `A = {1, {2, 3}, 4}`.
Then, which of the following statements is true ?
(i) `{2,3} in A` (ii) `{2,3} subset A`
Rectify the wrong statement.

Answer 1

Clearly, A is a set containing three elements, namely 1, {2,3} and 4.
(i) `{2, 3} in A` is a true statement.
(ii) `{2, 3} subset A` is wrong.
On rectifying this statement, we get `{{2,3}} subset A` as true statement.