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 possible groups of 4 is C(10, 4) = 210. Only one group consists of all four seniors, so the probability is 1/210 ≈ 0.00476, choice B.

AI-written and checked against the verified answer.