A set is denoted by capital letter symbol

Eg: A = {1, 2, 3, 4, 5}

Here
**
A
**
is the set.

1, 2, 3, 4, 5 are
**
elements of set
**
.

We can also write

1
**
belongs to
**
A

i.e.1
**
∈
**
A

Similarly,

2 ∈ A

3 ∈ A

4 ∈ A

5 ∈ A

Since, 6 is not in set A,

We write, 6 doesn’t belong to A

i.e. 6 ∉ A