Random team composition is what helps your professor let everyone shine as you complete the assignment. You are most likely to be placed in a group with people you have rarely interacted before, which is a great starting point for deep, meaningful conversation. On the other hand, if you were to choose your team, you would probably choose your friends.
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This is breeding ground for bias and lack of originality. When placed in a random team, one is more likely to try on a new role, maybe even show leadership skills that have not been seen before.
Moreover, a randomly assigned В team will closely resemble a real-world situation, preparing students for their future.