How many Australian Open titles has Novak Djokovic won

In how many ways can 7 boys and 2 girls can be seated in a row so that they are in alternate position.

Four dice are rolled simultaneously. What is the number of possible outcomes in which at least one of the die shows 2?

Find the quantity of methods of picking 4 cards from a set of 52 playing cards if four cards are of the same unit?

8 students appear in an examination. In how many ways can the result be announced?

How many 5-digit even numbers can be formed using the digits 0 to 9 if no digit is repeated?

In how many different ways can 6 History and 5Hindi books be arranged in a shelf so that they are arranged alternately?

In how many ways can a group of 2 boys and 2 girls be made out of a total of 6 boys and 4 girls?

How many three-letter words can be formed such that all letters are vowels, and no two letters are the same?

In how many ways Barcelona’s football team captain and vice-captain be elected from a team of 15 men?

A group consists of 9 boys and 7 girls. In how many ways can 4 boys and 3 girls be selected from the group?