Probability of Study Preferences

A recent survey was conducted among 1200 students at a university to assess their preference for various study methods. The results showed that:

• 600 students preferred studying alone.
• 400 students preferred studying in pairs.
• 200 students preferred group study.

Based on this survey, use the following pie chart to analyze how many students made each choice:

<insert pie chart image here>

If a student is randomly selected from the survey participants, what is the probability that this student prefers to study in pairs or in groups?