Find the number of ways in which ten distinct objects can be divided into two groups each containing 5 objects.

The number of ways in which n distinct objects can be put into two different boxes is:

Number of ways in which 12 different things can be distributed in 3 groups, is

Find the number of ways in which five identical balls can be distributed among ten boxes, if not more than one can go into a box.

Find the numbers of ways in which 5 girls and 5 boys can be arranged in a row if no two boys are together.

Which object can be made from leather?

Find the number of ways in which n things of which r are alike, can be arranged in a circular order.

A bag contains 6 white marbles and 5 red marbles. Find the number of ways in which four marbles can be drawn form the bag if 2 must be white and 2 red.

A bag contains 6 white marbles and 5 red marbles. Find the number of ways in which four marbles can be drawn form the bag if they can be of any colour.

A bag contains 6 white marbles and 5 red marbles. Find the number of ways in which four marbles can be drawn form the bag if they must all be the same colour.

Name the objects which can be made with paper.