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Ch 37: TACHS: Probability & Permutations

About This Chapter

Let the Probability & Permutations chapter of our TACHS test prep course help you prepare for the math section of the TACHS. The lessons in this chapter will make working with probabilities and permutations easy.

TACHS: Probability & Permutations - Chapter Summary

If you've ever played a game of cards or a board game that involved dice or a spinner, you've worked with probabilities whether you realized it at the time or not. These lessons show you how to calculate them mathematically so that you'll be prepared for the TACHS exam. The videos contain the following material:

  • Calculating simple conditional probabilities
  • Dependent vs. independent events, permutations
  • Using the fundamental counting principle
  • Calculating permutations and combinations

These video lessons make review effective, easy and fun. They're written in a lively, entertaining style that engages your attention, and you have quizzes to help you check your knowledge. You can review the videos as often as you like, go to specific sections using the timeline feature, and ask questions whenever you need help.

TACHS: Probability & Permutations Chapter Objectives

The TACHS exam covers four subject areas: reading, writing, math and general reasoning skills. Passing the test is required for entry into many Catholic high schools, and the test also serves as a placement guide for students entering ninth-grade classes. This chapter aligns with the mathematics subtest.

The test is paper-based, and all questions are in multiple choice form. Following each question is a list of several possible responses, from which you select the one that answers the question correctly.

7 Lessons in Chapter 37: TACHS: Probability & Permutations
Test your knowledge with a 30-question chapter practice test
How to Calculate Simple Conditional Probabilities

1. How to Calculate Simple Conditional Probabilities

Conditional probability, just like it sounds, is a probability that happens on the condition of a previous event occurring. To calculate conditional probabilities, we must first consider the effects of the previous event on the current event.

Probability of Independent and Dependent Events

2. Probability of Independent and Dependent Events

Sometimes probabilities need to be calculated when more than one event occurs. These types of compound events are called independent and dependent events. Through this lesson, we will look at some real-world examples of how to calculate these probabilities.

How to Use the Fundamental Counting Principle

3. How to Use the Fundamental Counting Principle

There are many situations in which you will have to make several decisions simultaneously. The fundamental counting principle will help you determine how many different possible outcomes there are when you have to make multiple simultaneous decisions.

How to Calculate a Permutation

4. How to Calculate a Permutation

A permutation is a method used to calculate the total outcomes of a situation where order is important. In this lesson, John will use permutations to help him organize the cards in his poker hand and order a pizza.

How to Calculate the Probability of Permutations

5. How to Calculate the Probability of Permutations

In this lesson, you will learn how to calculate the probability of a permutation by analyzing a real-world example in which the order of the events does matter. We'll also review what a factorial is. We will then go over some examples for practice.

Math Combinations: Formula and Example Problems

6. Math Combinations: Formula and Example Problems

Combinations are an arrangement of objects where order does not matter. In this lesson, the coach of the Wildcats basketball team uses combinations to help his team prepare for the upcoming season.

How to Calculate the Probability of Combinations

7. How to Calculate the Probability of Combinations

To calculate the probability of a combination, you will need to consider the number of favorable outcomes over the number of total outcomes. Combinations are used to calculate events where order does not matter. In this lesson, we will explore the connection between these two essential topics.

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

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