# Ch 21: ACT Math: Probability, Combinations & Factorial

### About This Chapter

Need to brush up on probabilities, combinations, or factorials before taking the ACT? This chapter features engaging video lessons to teach you these concepts that you may encounter on the ACT exam. Quiz yourself with lesson quizzes to make sure you are ready for these questions!

## ACT Math: Probability, Combinations and Factorial - Chapter Summary

You'll review essential pre-algebra skills in this chapter. An understanding of the topics in these lessons helps to form a foundation for the higher-level math skills:

• Probability: independent and dependent events
• Overlapping and non-overlapping events (either/or probability)
• Probability of compound and complementary events
• Calculating combinations and permutations
• Factorial

Watch the fun and engaging video lessons, review factorial and math combinations with the practice exercises, and then complete the self-assessment quizzes.

### ACT Math Objectives

The math test is a 60-minute, 60-question exam that analyzes your logic skills in solving practical problems, showing whether you're ready for entry-level college coursework. You won't need to recall complicated formulas, but the test does assume that you'll have an understanding of basic formulas and key computations.

The pre-algebra portion of the test makes up 23% of the problems. You'll demonstrate your ability to complete many of the following functions:

• Basic operations with whole numbers, fractions and decimals
• Factors
• Ratio, percent and proportion
• Basic counting techniques and simple probability
• Data collection and interpretations
• Understanding simple statistics

Once you've worked your way through our video lessons, quizzes and practice exercises, you can target any areas that need more review for the test. You'll receive an overall ACT math score on all 60 questions, in addition to three sub-scores for pre-algebra/elementary algebra, intermediate algebra/coordinate geometry and plane geometry/trigonometry.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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### Other Chapters

Other chapters within the ACT Prep: Practice & Study Guide course

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