In how many different ways is the ecosystem is classified ?

Enlist different types of ecosystem?

In how many different ways can 3 students be associated with 4 Chartered Accountants, assuming that each Chartered Accoundtant can take at most one student?

What are the different ways in which the polymers can be classified?

First, second and third prizes are to be awarded at an engineering fair in which 13 exhibits have been entered. In how many different ways can the prize be awarded?

A committee of 6 is to be chosen from 10 men and 7 women, so as to contain at least 3 men and 2 women. In how many different ways can this be done, if two particular women refuse to serve on the same committee?

How the plants are classified ?

Which are the different types of ecosystems?

How are carbohydrates classified?