After every get-together every person present shakes the hand of every other person. If there were 105 handshakes in all, how many persons were present in the party?
Correct Answer : C
In how many ways can 5 different toys be packed in 3 identical boxes such that no box is empty, if any of the boxes may hold all of the toys?
36 identical chairs must be arranged in rows with the same number of chairs in each row. Each row must contain at least 3 chairs and there must be at least 3 rows. A row is parallel to the front of the room. How many different arrangements are possible?
Find the total number of distinct vehicle numbers that can be formed using two letters followed by two numbers. Letters need to be distinct.