The fundamental counting principle can be very helpful when you need to figure out the possible number of outcomes of multiple events. The principle essentially works like this: If there are m possible ways for an event to occur, and n possible ways for another event to occur, there are m x n possible ways for both events to occur. In this lesson, we will apply the principle to real-life scenarios to see how it works.
Fundamental Counting Principle Involving Restrictions – “restriction must be dealt with first!”
How many odd four digit numbers are there?
An example of a four digit number is 3581, while 0492 is a three digit number.
Use only the digits 2, 4, 5, 6, 7, 8 and 9 to produce four digit numbers.
Fundamental counting principle
Don't just watch, practice makes perfect.
We have 867 practice questions in Sixth Year Maths for you to work through.