In order to demostrate that you understand Fundamental Counting Principle, you can use the following example:
You take a survey with seven “yes” or “no” answers. How many different ways could you complete the survey?
There are 7 stages: question 1, question 2, question 3, question 4, question 5, question 6 and question 7.
There are 2 choices for each question: yes - no
The total number of possible ways to answer is given by the number of choises "2" power the number of stages:
2^7 = 2 * 2 * 2 * 2 * 2 * 2 * 2 = 128