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?

There is certain numbers of toys in the box. They are divided into such a way that the person who gets 1/4 of the whole gets thrice of what the others get on an average. Find the number of people amongst whom the toys are distributed?

How many positive integers 'n' can be form using the digits 3,4,4,5,6,6,7, if we want 'n' to exceed 60,00,000?