What is another expression for the factorial of #n#?

1 Answer
MeneerNask
Jun 23, 2015

Factorial #n#, or #n!# means:
Multiply all numbers from 1 up to and including #n#

Explanation:

Just as we have a summation sign #Sigma# (greek letter S for sum), there is also a multiplication sign #Pi# (greek P for product)

The expression would then be:

#n! = prod _(k=1)^n k#

Meaning: multiply all numbers #k#, varying from #1# to #n#.

The #!#-notation is more compact, but the #Pi#-notation can be used for a lot of other purposes.

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