Write each of the following sets in set- builder form :
F= [April , June , september , November}.

Answer

To express the set \( F = \{ \text{April}, \text{June}, \text{September}, \text{November} \} \) in set-builder form, we can follow these steps:

### Step 1: Identify the elements of the set
The elements in the set \( F \) are the months: April, June, September, and November.

### Step 2: Determine a common property
We need to find a common property that defines these months. One common property is that they are all months of the year that have 30 days.

### Step 3: Write in set-builder notation
In set-builder notation, we denote the set as follows:
\[ F = \{ x \mid x \text{ is a month of the year having 30 days} \} \]

### Final Answer
Thus, the set \( F \) in set-builder form is:
\[ F = \{ x \mid x \text{ is a month of the year having 30 days} \} \]

---