Python | sympy.factorial2() method
Last Updated :
14 Jul, 2019
With the help of
sympy.factorial2() method, we can find the
Double factorial. Double factorial of a number is given by –
Syntax: factorial2(n)
Parameter:
n – It denotes the number whose double factorial is to be calculated.
Returns: Returns the double factorial of number, i. e., n.
Example #1:
from sympy import *
n = 10
print ( "Value of n = {}" . format (n))
factorial2_n = factorial2(n)
print ( "Double factorial of n : {}" . format (factorial2_n))
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Output:
Value of n = 10
Double factorial of n : 3840
Example #2:
from sympy import *
n = - 3
print ( "Value of n = {}" . format (n))
factorial2_n = factorial2(n)
print ( "Double factorial of n : {}" . format (factorial2_n))
|
Output:
Value of n = -3
Double factorial of n : -1
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