Answer: 1/3 chance
Explanation:
If you have a total set of options for a clip color, then this is your denominator for the probability ratio. The amount of clips matching the color you desire is the numerator for the probability ratio. We want a white clip (there's 5) out of the bag of clips (there's 15). We can make a ratio like this:
5:15 - 1:3 or 1/3
This is our ratio representing the probability of getting a white clip. Hope this helps!