How many different words can be formed with the letters of the word PRACTICE such that each of the word begin with E and ends with R?
11 people decided to spend an afternoon in two groups. A group of them decided to go to the theater and the remaining decided to play tennis. In how man...
Four dice are rolled simultaneously. What is the number of possible outcomes in which at least one of the die shows 2?
In an examination of 5 subjects, it is mandatory for a student to pass in each subject. In how many ways can she fail?
In How many ways can a student choose a program of 5 courses, if 9 courses are available and 2 courses are compulsory for every student?
In how many ways Barcelona’s football team captain and vice-captain be elected from a team of 15 men?
There are 10 boys and 15 girls in the commerce class. Three students are selected at random. Find the probability that 2 girls and 2 boys are selected.
In how ways can the selection be made so that a particular member is always excluded?
...Among a set of 4 black balls and 3 white balls, how many selections of 3 balls can be made such that at least 2 of them are black balls?
In how ways can the selection be made so that a particular member is always excluded?
