How many flags have the only 3 colors red green and white

Several national flags feature the colors red, green, and white. Here are a few notable examples:

1. Italy - The flag consists of three vertical stripes: green, white, and red.
2. Hungary - The flag consists of three horizontal stripes: red, white, and green.
3. Bulgaria - The flag has three horizontal stripes: white, green, and red (with the red stripe at the bottom).
4. Mexico - The flag consists of three vertical stripes: green, white, and red, with the national emblem (an eagle and serpent) in the center of the white stripe.
5. Iran - The flag consists of three horizontal bands of green, white, and red, with the national emblem in the center.
6. Kuwait - The flag has horizontal black, white, and green stripes, with a vertical red stripe on the left.
7. Palestine - The flag has horizontal black, white, and green stripes, with a red triangle at the hoist.

These are some instances of flags featuring red, green, and white. The exact count and inclusion can vary based on the criteria used, such as whether you're only considering fully national flags or including regional or historical ones.