Write down all possible subsets of each of the sets given below :
`phi `

Answer

To find all possible subsets of the empty set (denoted as φ), we can follow these steps:

### Step 1: Understand the Definition of a Subset
A subset is a set that contains some or all elements of another set. The empty set is a special case because it has no elements.

### Step 2: Determine the Number of Elements in the Empty Set
The empty set (φ) has no elements. Therefore, the number of elements (n) in the empty set is 0.

### Step 3: Use the Formula for the Number of Subsets
The number of subsets of a set is given by the formula 2^n, where n is the number of elements in the set. Since n = 0 for the empty set, we calculate:
\[ 2^0 = 1 \]

### Step 4: List the Subsets
Since there is only one subset when n = 0, the only subset of the empty set is the empty set itself (φ).

### Final Answer
The only subset of the empty set φ is:
- {φ}