A class has 4 girls and 5 boys. 3 students are chosen at random to form a team. Find the probability that all the students chosen are girls.
Remember: The order of drawing does not matter. Count the ways of choosing from the wanted group, and divide by the ways of choosing from everything.
A class has 7 girls and 8 boys. 2 students are chosen at random to form a team. Find the probability that all the students chosen are girls.
A class has 8 girls and 6 boys. 3 students are chosen at random to form a team. Find the probability that all the students chosen are girls.
A bag holds 6 red balls and 9 blue balls. 2 balls are drawn at random without replacement. Find the probability that all the balls drawn are red.
Five questions on this topic, marked at the end. No hints and no answers along the way — that is what makes the result mean something.
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