A hall has four entrances and five exits . In how many ways can a man enter and exit from the hall ?

Explanation

To solve the problem of how many ways a man can enter and exit from a hall with four entrances and five exits, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Entrances and Exits:**
- The hall has 4 entrances: Let's label them as Entrance 1, Entrance 2, Entrance 3, and Entrance 4.
- The hall has 5 exits: Let's label them as Exit 1, Exit 2, Exit 3, Exit 4, and Exit 5.

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