Revision as of 15:55, 25 June 2018

FACTDOUBLE(Number)

FACTDOUBLE(), returns the double factorial of a number.

FACTDOUBLE(Number)

e.g. FACTDOUBLE(6) displays 48 as a result.

$N!!=N*(N-2)*(N-4)*.....4*2$

$N!!=N*(N-2)*(N-4)*.....3*1$

If $Number$ is negative, Calci displays #N/A error message.
If $Number$ is not an integer, it is truncated to calculate the double factorial.
If $Number$ is invalid, Calci displays #NULL error message.
The double factorial of series of numbers can be calculated as -

e.g. FACTDOUBLE(1..5) calculates double factorial of numbers from 1 to 5 and displays result as 1 2 3 8 15.

@@ Line 1: / Line 1: @@
-=FACTDOUBLE(N)=
+=FACTDOUBLE(Number)=
-*where, <math>N</math> is a positive integer whose double factorial is to be found.
+*<math>Number</math> is a positive integer whose double factorial is to be found.
+FACTDOUBLE(), returns the double factorial of a number.
-FACTDOUBLE() calculates the double factorial of a number.
 == Description ==
-FACTDOUBLE(N)
+FACTDOUBLE(Number)
 e.g. FACTDOUBLE(6) displays '''48''' as a result.
-*<math>N</math> should be a positive integer.
+*<math>Number</math> should be a positive integer.
 *The factorial of an even number is calculated as -
@@ Line 18: / Line 19: @@
 <math>N!! = N * (N-2) * (N-4) * .....3 * 1</math>
-*If <math>N</math> is negative, Calci displays #N/A error message.
+*If <math>Number</math> is negative, Calci displays #N/A error message.
-*If <math>N</math> is not an integer, it is truncated to calculate the double factorial.
+*If <math>Number</math> is not an integer, it is truncated to calculate the double factorial.
-*If <math>N</math> is invalid, Calci displays #NULL error message.
+*If <math>Number</math> is invalid, Calci displays #NULL error message.
 *The double factorial of series of numbers can be calculated as -
 e.g. FACTDOUBLE(1..5) calculates double factorial of numbers from 1 to 5 and displays result as '''1  2  3  8  15'''.