Answer:
This depends on what other colors are in the question. But put 1/x and replace the x with how many colors there are and thats thier probabilaty of choosing purple.
Explanation:
Theres no possible way of knowing unless you already have met and or know the person so if theres green, blue, pink, yellow, and purple, theres 5 colors and purple is 1 out of them therefore, 1/5