SASMO 2016 Secondary 4 (Grade 10) Contest Question 3

Question 3

A 10-sided dice with numbers from 1 to 10 on its faces is thrown once. Which of
the following events has the lowest probability of occurrence?

1. The number rolled is a prime number
2. The number rolled is an even number
3. The number rolled is a multiple of 3
4. The number rolled is one less than an even number
5. None of the above