There are 10 lamps in a hall. Each one of them can be switched on independently. Find the number of way which the hall can be illuminated.

Number of ways in which 8 boys can sit in a circle

Name a micro-organism which can live independently.

There are p copies each of n different books. Find the number of ways in which a nonempty selection can be made from them.

Number of ways in which is 8 boys can sit in a circle?

In an examination, the maximum marks for each of the three papers are 50. Maximum marks for the fourth paper are 100. Find the number of ways in which the candidate can score 60% marks in aggregate.

Six candidates are called for interview to fill four posts in an office. Assuming that each candidate is fit for each post. determine the number of ways in which : first three posts can be filled.

In an examinations there are three multiple choice questions and each questions has 4 choices. Find the number of ways in which a student can fail to get all answer correct.

n different toys have to be distributed among n children. Find the number of ways in which these toys can be distributed so that exactly one child gets no toy.

Six candidates are called for interview to fill four posts in an office. Assuming that each candidate is fit for each post. determine the number of ways in which : all the four posts can be filled.