Answer to Question #266351 in Discrete Mathematics for Sya

Question

List all strings over X = {0,1}  of length 2 or less.

Answer 1

The empty string $\varepsilon$  is a binary string of length 0.

and $1$ are binary strings of length 1.

$00, 01, 10, 11$ are binary strings of length 2.

$$\varepsilon,0,1,00,01,10,11$$