This is a stats questions. I'm confused as to how to approach and solve this problem using the probability rules ( i.e conditional probability,...

This is a stats questions. I'm confused as to how to approach and solve this problem using the probability rules ( i.e conditional probability, addition rule, multiplication rule, bayes' rule, etc.) If someone could guide me as to how to solve this problem, it will be greatly appreciated. Thank you.

Left handed people make up about 10% of the general population.  Suppose that four people are selected at random from the general population.  What is the probability that all four people are left handed?