Lesson: Applied Arithmetic - 22

Factorials

[Page 22 of 36]

Factorials are very simple things. They're just products, indicated by an exclamation mark. For instance, "four factorial" is written as "4!" and means 1×2×3×4 = 24. In general, n! ("enn factorial") means the product of all the whole numbers from 1 to n; that is, n! = 1×2×3×...×n.

You may see the following on a standardized test:

You should not read this to mean: emphatically seven! That exclamation point, as a mathematical symbol, represents the factorial function, and here's what it means:

In other words:

If you see a question involving factorials on a standardized test, you generally won't have to calculate the value of the factorial. Instead, factorial questions tend to test your ability to factor or reduce, so you should take note of the following:

, and so on.

Let's take a look at an in-format question.

Back Next

Next to display next topic in the chapter.

Video Lessons and 10 Fully Explained Grand Tests

Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.

Quantitative Aptitude Reasoning English General Knowledge Picture Patterns

Jobs in Pakistan Induction process Test Prep Sections Practice MCQs Admission Tests Test Sections Success on Tests Study in USA Pak Universities Employment ISSB Preliminaries Articles and Essays Schools & Colleges Study Abroad Career News

Arithmetic Geometry Data Interpretation Problem Solving Data Sufficiency Quant. Comparison

English Vocabulary English Correction Antonyms Synonyms Analogies Fill in the Blanks Critical Reading Text Completion

Number Series Picture Pattern Critical Reasoning Analytical Reasoning

Writing

Physics Chemistry Biology Mathematics Pak Penal Code Islamic Hudood Laws

Problem Solving Strategies Applied Arithmetic Algebra Advance Algebra Problem Solving 1 Problem Solving 2 Practice MCQs Applied Arithmetic Basic to Advance Percents Percents Change Ratios Introducing Rates Practice Rate Problems Introducing Averages Mean, Median, Mode And Range Factorials Probability Combinations And Permutations, continued Next Steps

MCQ with question Explanations Scholarships and Financial Aid

Lesson: Applied Arithmetic - 22

Factorials

Video Lessons and 10 Fully Explained Grand Tests

Current Menu

More for You

Quantitative Comparison

Arithmetic

GMAT: Graduate Management Admission Test

You may be interested in

Colleges in Multan

Colleges in Dera ismail khan

Scholarships News

Merits in Pakistan

Join Pakistan Navy

GRE Psychology

AIMC - MBBS

PIDE Pakistan Institute of Development Economics

About us

Quick Test Prep

Study Abroad

Lesson: Applied Arithmetic - 22

Factorials

Video Lessons and 10 Fully Explained Grand Tests

Current Menu

Main Menu (Click/Tap to Open)

Current Menu

Quantitative

Verbal

Logical/Reasoning

Writing

Subjects

problem Solving

More for You

Quantitative Comparison

Arithmetic

GMAT: Graduate Management Admission Test

You may be interested in

About us

Quick Test Prep

Study Abroad