Question

Let A = {1, 2, 3, 4, 5, 6). Insert the appropriate symbol ∈ or ∉ in the blank space: 0. . . A

Answer 1

As 0 is Not in set A

0∉A

hope its helpfull

Answer 2

here , A = {1, 2, 3, 4, 5, 6} . e.g., A is the collection of all natural number less than and equal to 6. means , all numbers e.g., 1 , 2, 3, 4, 5, 6 belong to A.

you should remember that,
$\in$ is symbol of " belongs to "
$\notin$ is symbol of " doesn't belong to "
Here , 0 doesn't belong to A .
so, $\bf{0\notin A}$