1. Determine the number of permutations of four objects taken 4 at a time.
2. How many ways can seven awards be displayed in the row on the shelf?
3. How many seven letter patterns can be formed from letters in word lessons?
4. In how many ways can four children be seated on the four animal merry go round if Andy is seated on giraffe?
5. In how many ways can eight keys be arranged on the key ring.
6. From the group of 12 people, how many groups of five can be chosen?
7. Find value of n in equations C(n,4)=C(n,5).