How many elements has P(A), if `A =varphi`?

Explanation

To solve the question "How many elements has P(A), if A = ∅?", we need to follow these steps:

### Step 1: Understand the concept of the empty set
The empty set, denoted as ∅, is a set that contains no elements.

**Hint:** Remember that the empty set is defined as having zero elements.

### Step 2: Define the power set
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