If E and F are mutually exclusive, then `P(E nn F)` is equal to __________(Fill in the Blank)

Answer

To solve the question, we need to understand the concept of mutually exclusive events in probability.

### Step-by-Step Solution:

1. **Definition of Mutually Exclusive Events**:
- Two events E and F are said to be mutually exclusive if they cannot occur at the same time. This means that if one event occurs, the other cannot.

2. **Understanding Intersection of Events**:
- The intersection of two events, denoted as \( P(E \cap F) \), represents the probability that both events occur simultaneously.

3. **Analyzing the Given Events**:
- Since E and F are mutually exclusive, it follows that there are no outcomes that are common to both events. Therefore, the intersection of E and F contains no elements.

4. **Calculating the Probability**:
- Since the intersection \( E \cap F \) is empty (i.e., it contains no elements), the probability of the intersection is:
\[ P(E \cap F) = 0 \]

5. **Final Answer**:
- Thus, \( P(E \cap F) \) is equal to **0**.