Events happen in order

CONCEPTS

Equation

• Probability of >1 events occurs in order = (Probability Event A - 1) * (Probability Event B - 1) etc

Tips

• Always look for “and” in the question. Also, look for "happens in order". These are and event probability problems that happen in order.

PRACTICE PROBLEMS

Question 1 What is the probability 4 racers will come in the order 3-4-1-2?

-- Answer -- 1/24

1/4 * 1/3 * 1/2 = 1/24

The 1st pick will have 4 racers and 1 will be selected. The 2nd pick will have 3 racers and 1 will be selected. The 3rd pick will have 2 racers and 1 will be selected

ACT PRACTICE PROBLEMS