#### Answer

true

#### Work Step by Step

Natural numbers are the counting numbers $1, 2, 3, ...$.
Thus, the natural numbers less than 3 are and 2.
This means that the set on the left side is $\left\{1, 2\right\}$.
Two sets are equal if they have exactly the same elements.
Note that $\left\{1, 2\right\} = \left\{1, 2\right\}$.
The two sets have exactly the same elements therefore they are equal sets.
Thus, the given statement is true.