How many different signals can be given using any number of flags from 4 flags of different colours?

Explanation

To solve the problem of how many different signals can be given using any number of flags from 4 flags of different colors, we can follow these steps:

### Step 1: Understand the Problem
We have 4 flags of different colors, and we need to determine how many different signals can be created using any number of these flags.

### Step 2: Identify the Number of Flags
Let’s denote the flags as A, B, C, and D. We have a total of 4 flags.

...