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

Explanation

To find how many elements the power set \( P(A) \) has when \( A = \varphi \) (the empty set), we can follow these steps:

### Step-by-Step Solution

1. **Understand the Definition of a Power Set**:
The power set \( P(A) \) of a set \( A \) is defined as the set of all possible subsets of \( A \).

2. **Identify the Set**:
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