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Factorial
The factorial of 4, which is written as
, is
. Similarly,
. The number
grows very quickly as
increases. The double factorial of a number
, which is written as
, is an extension to the normal factorial. When
is odd,
. When
is even,
.
Contributed by:
Ed Pegg Jr
Additional Contributions by:
Rob Morris
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Factorial
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Double Factorial
(
Wolfram
MathWorld
)
PERMANENT CITATION
"
Factorial
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/Factorial/
Contributed by:
Ed Pegg Jr
Additional Contributions by:
Rob Morris
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Related Curriculum Standards
US Common Core State Standards, Mathematics
HSF-BF.A.1
HSF-IF.A.3