Question

Let A = {1, 2, 3, 4, 5, 6). Insert the appropriate symbol ∈ or ∉ in the blank space: 10. . . A

Answer 1

As 10 is Not in set  A

10∉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, 10 doesn't belong to A.
means, $\bf{10\notin A}$