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What does a ! mean in math terms?

 

I really want to know this and I can't figure out what it is for.

dogeminer  May 13, 2015

Best Answer 

 #2
avatar+87321 
+10

This is called a "factorial"......it is the procuct of all the positive integers up to, and including, "n"

 

For example.....  n!   ....  where n = 3....we have     1 x 2  x 3   = 6

 

Or  .....   n!  ....    where n = 4 =    1 x 2 x 3 x 4 = 24

 

This concept is very useful in statistics and probabilty in "counting" operations

 

BTW  ....   0!   is defined to be =  1

 

 

  

CPhill  May 13, 2015
 #1
avatar
+5

it means you multiply all the numbers up to that number together. for example, 5! = 1*2*3*4*5 or 120

Guest May 13, 2015
 #2
avatar+87321 
+10
Best Answer

This is called a "factorial"......it is the procuct of all the positive integers up to, and including, "n"

 

For example.....  n!   ....  where n = 3....we have     1 x 2  x 3   = 6

 

Or  .....   n!  ....    where n = 4 =    1 x 2 x 3 x 4 = 24

 

This concept is very useful in statistics and probabilty in "counting" operations

 

BTW  ....   0!   is defined to be =  1

 

 

  

CPhill  May 13, 2015
 #4
avatar+92805 
+5

Thanks Heureka 

I always forget about that left factorial.  I am really pleased that you reminded me :))

Melody  May 14, 2015

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