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?
(15C1)*(20C2) = 15×190 = 2850 combinations. Total possible combinations = 35C3 = 6545 2850/6545 = 0.43545 = 43.545%.
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?
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?
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?
Two digits are selected at random from digits 1 through 9. If sum is even, find the probability that both numbers are odd?
