Find the number of different signals that can be generated by arranging at least 2 flags in order (one below that other) on a vertical staff, if five different flags are available.

Explanation

To find the number of different signals that can be generated by arranging at least 2 flags in order on a vertical staff using 5 different flags, we can break down the problem into cases based on the number of flags used.

### Step-by-Step Solution:

1. **Identify the Flags**: We have 5 different flags, which we can denote as A, B, C, D, and E.

2. **Case 1: Arranging 2 Flags**:
- We can choose any 2 flags from the 5 available flags.
...