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 TOPICS This page:   factorials    Search   Dr. Math See also the Internet Library:   factorials MIDDLE SCHOOL About Math Algebra    equations    factoring expressions    graphing equations Arithmetic    division    exponents    factorials    factoring numbers    fractions/percents    logarithms Definitions Geometry    2-dimensional      conic sections/        circles      triangles/polygons    3D and higher      polyhedra History/Biography Logic Measurement    calendars/      dates/time    temperature    terms/units Number Sense    factoring numbers    negative numbers    pi    prime numbers    square roots Probability Puzzles Ratio/Proportion Statistics Word Problems Browse Middle School Factorials Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     Table of factorials, 1!-30! Given a Factorial, Find the Number [05/02/2003] How can we find a number if the factorial is given? Smallest Value of N!; Factorial Table [11/07/2001] If N! ends in exactly 3 zeros, what is the smallest possible value of N? What Is N Factorial Used For? [08/29/2001] I have heard that it is used in probability, but what for, and how? x Factorial and the Gamma Function [05/29/1998] What is x! when x is 0, negative, or not a whole number? Choosing 3 of 6 Colors [03/03/2000] Patrick has a box of crayons with red, blue, yellow, orange, green and purple. How many different ways can Patrick select 3 colors? Circumference of a Circle, Value of 5! [5/15/1996] The area of a circle is 16 pi. What is the circumference of the circle? Also, what is the value of 5!? Combinations of Coins [1/28/1996] If I had 6 coins in my pocket, how many combinations could I have? Decimal Places in Large Factorials [04/29/2003] Is there an easy way to find how many decimal places or how many zeros the decimal notation of a large factorial number will have? Derivative of x! [05/27/2003] My Pre-Calculus teacher gave my class several derivative practice problems to do in our spare time, one of which is: (d/dx)(x!). Double Factorial [02/22/2002] Can you tell me what two ! marks mean in factorial questions? Factorial [4/1/1996] What is factorial? Factorials [11/15/1994] One day when I was playing on a calculator, I found that 1 and 0 both have a factorial of 1. Can you explain this? Factorials [02/07/1998] How do you find the number of zeros at the end of a number factorial? For example, 100! or 130! Factorials [2/3/1996] What does 3! mean? Factorials and Order of Operations [09/21/2000] Where do factorials go in the order of operations? Factorials of Negative Integers [06/27/2002] Is it possible to compute factorials for negative integers? Find the Last Eight Digits of a Factorial [1/30/1996] Find the last eight digits of 69! where 69!=69x68x67........x1 Given x!, Find x [12/21/2002] If the value of x! is given, how do we find the value of x? Googol Factorial [11/09/1996] What is googol factorial? How Big is a Googolplex? [05/29/2003] Is there anything on Earth that is as big as a googolplex? How to Evaluate 4!!!! [10/16/2003] Our Calculus 2 teacher has challenged us to find the exact value for 4!!!!, but the number is too large to reasonably calculate by hand. An Informal Argument for Why 0! = 1 [01/13/2008] I don't understand why 0! equals 1. Can you explain it? Odd Factorial [12/24/2001] Can a factorial ever be odd? Origin of the Factorial Symbol ! [01/14/2002] My students would like to know the origin of the mathematical symbol for factorial - !. Representing a Number [10/29/2001] How can you represent the number three without using any letters or variables or the digits 1 through 9? Six Billion Factorial [05/15/2003] 6 billion p 100. I know how to do permutations but there must be a quick way to do a problem like this. Zero Factorial [05/24/1999] Why does 0! = 1? Page:  1

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