In a zoo, there are 15 rabbits and 10 rhinos. Three animals are selected in random. What is the probability that 1 rhino and 2 rabbits are selected?
15C2*10C1/25C3 = 21/46
There are 12 boys and 9 girls in a class. If three students are selected at random, what is the probability that 1 girl and 2 boys are selected?
In a class, there are 20 males and 15 females. Three students are selected at random. What is the probability that 1 female and 2 males are selected?
There are 8 boys and 5 girls in a class. If four students are selected at random, what is the probability that 2 girls and 2 boy are selected?
Three points are selected at random on a sphere's surface. What is the probability that they all lie in the same hemisphere? Assume that the great circle, bordering a hemisphere, is part of the hemisphere.
