does anyone know/recall what the mathematical symbol, "!", means? is it called a, "bang", as in comp sci?

Question

what is it's function? is it 1+2+3, etc., or 1*1*1, etc. i know it's in there, somewhere.

Answer 1

No. This symbol, the exclamation point, indicates an operation called "factorial." For example, 7! = 7X6X5X4X3X2X1, and so forth. It's said, "Seven factorial." That's all there is. Commonly used in statistics, computstions of odds, and operations like computing interest on loans, etc. Think of a deck of cards, and the liklihood of getting a specific hand. With each card dealt out, the set of remaining possibilities is smaller by one-52X51X50...

Answer 2

If it looked like "5!" that means that it is 5 x 4 x 3 x 2 x 1.

Answer 3

In mathematics the symbol represents the factorial operation. The expression n! means "the product of the integers from 1 to n". For example, 4! (read four factorial) is 4 × 3 × 2 × 1 = 24. (0! is defined as 1, which is a neutral element in multiplication, not multiplied by anything.)

In computer programming, the exclamation mark corresponds to ASCII character 33 (21 in hexadecimal). It is therefore found in Unicode at U+0021. The inverted exclamation mark is found in ISO-8859-1, 9 and 15 at position 161 (A1HEX) and therefore in unicode at U+00A1.

Several computer languages use "!" for various meanings, most importantly for logical negation; e.g. A != B means "A is not equal to B", and !A means "the logical negation of A" (also called "not A"). In this context, the exclamation is named the bang character; other programmers call it a shriek or screech. Invented in the US, it is claimed that bang is from Unix and shriek from Stanford or MIT; however, shriek is known to have been in use in the 1860s. In the BBC BASIC programming language (and BCPL) it is called a pling and is used to reference a 32-bit word.

Plings are also used in Acorn RISC OS to denote an "appfolder": a folder that when double clicked executes a program file inside called !Run. Other files in the appfolder generally contain resources the application needs to run. The appfolder can be viewed as a normal folder by double-clicking with the shift key held down. In addition, other special resource files such as !Boot (executed the first time the application containing it comes into view of the filer) and !Sprites (an icon file containing icon definitions loaded if !Boot cannot be found) also start with a pling.

Early e-mail systems also used the exclamation point as a separator character between hostnames for routing information, usually referred to as "bang path" notation.

In the IRC protocol, a user's nickname and ident are separated by an exclamation point in the hostmask assigned to him or her by the server.

In the Geek Code version 3, "!" is used before a letter to denote that the geek refuses to participate in the topic at hand. In some cases, it has an alternate meaning, such as G! denoting a geek of no qualifications, !d denoting not wearing any clothes, P! denoting not being allowed to use Perl, and so on. They all share some negative connotations however.

When computer programs display messages that alert the user, an exclamation mark may be shown alongside it to indicate that the message is important and should be read. This often happens when an error is made, or to obtain user consent for hazardous operations such as deleting data.

In UNIX shell and Perl scripting, "!" is usually used after a "#" in the first line of a script to tell the OS what program to use to run the script. This is usually called a "hash-bang" (see also: Shebang).

In recent Internet culture, an excessive way of expressing exclamation in text is seen as !!!!!!111. This notation originates from the eagerness to add multiple exclamation marks but failing to hit the shift key combination properly. Later this behaviour has evolved into a sign of recognition for certain Internet cultures who now intentionally add 1s after their expressions either to ridicule people who do it without purpose or as a sign of recognition towards others who also are familiar with the behaviour. As a further pun to this development of linguistics, some add literal ones such as !!!eleventyone!!111one! to explicitly state that their use of 1s was intentionally typed, since eleventyone cannot easily be typed by accident

Answer 4

ooooo, math 12A...such a long time ago! I think if you write a ! symbol it means the last number in a sequence times the second last, times the third last, etc, until you times it by the last.

ie) (1,3,5,...,11,13) if the ! function were applied to this it would be 13*11*9*7*5*3*1=whatever

Answer 5

I think it is "factorial." The factorial of a number is the answer you get if you multiply it all the numbers less than it. Example is 6! is 1x2x3x4x5x6.

Answer 6

it is called a factorial........
it work something like this.
x!=x*x-1*x-2*.......*1
eg.. 5!=5*4*3*2*1

Answer 7

it's factorial simbol...if i am not mistaken it's 1*2*3*4 etc...

Answer 8

isn't it called factorial?
like 5! = 5x4x3x2x1?

Answer 9

"Factorial". 4! = 4x3x2x1