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# What does a ! mean in math terms?

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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

#2
+89953
+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
+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
+89953
+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
#3
+20025
+5
heureka  May 13, 2015
#4
+93656
+5

Thanks Heureka

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

Melody  May 14, 2015