Question

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

Answer 1

As 5 is in set A

5∈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 5 belongs to A
so, 5 $\in$ A