In how many ways can a leap year have 53 Sundays?

Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?

A letter lock consists of 4 rings, each ring contains 9 non-zero digits. This lock can be opened by setting four digit c…

A selection committee is to be chosen consisting of 5 ex-technicians. Now there are 12 representatives from four zones. …

A committee of 5 members is to be formed out of 3 trainees, 4 professors and 6 research associates. In how many differen…

In how many different ways can the letters of the word AWARE be arranged?

A book-shelf can accommodate 6 books from left to right. If 10 identical books on each of the languages A,B,C and D are …

How many ways can 10 letters be posted in 5 post boxes, if each of the post boxes can take more than 10 letters?