Four seniors and six juniors are competing for four places on a quiz bowl team. What is the approximate probability that all four seniors will be chosen at random?

There are 10 students total, and the number of ways to choose 4 team members is C(10,4) = 210. Only one of those groups consists of all four seniors, so the probability is 1/210 ≈ 0.00476. The approximate probability is 0.00476, choice D.

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