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Q: What is 1 factorial?

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As we know product of no numbers at all is 1 and for this reason factorial of zero =1and we know factorial of 1=1

factorial of -1

Zero factorial = 1

#include int main() { int fact,Factorial; printf("Please Enter Factorial Number\n"); scanf("%d",&fact); Factorial=func_fact(fact); printf("factorial is %d\n",Factorial); } int func_fact(int number) { int i; int factorial=1; for(i=number;i>=1;i--) { factorial=factorial*i; } return factorial; }

Factorial(0), or 0! = 1.

Factorial is a Mathematical Function.Factorial returns the product of all numbers from 1 to itselfe.g. Factorial 5 = 5*4*3*2*1 = 120It is expressed as n! = factorial of nTo implement it in Visual Basic, there are two methods-Function factorial(ByVal n as Integer) as IntegerIf n =< 1 Then factorial = 1:Exit Functionfactorial = n * factorial(n-1)End FunctionFunction factorial(ByVal n as Integer) as Integerfactorial = 1Dim a as IntegerFor a = 1 to nfactorial = factorial * aNext 'aEnd Function

You get the factorial by multiplying the number with every number before down to 1. Factorial of 3 would be 3! = 3 * 2 * 1 = 6 or the factorial of 5 would be 5! = 5 * 4 * 3 * 2 * 1 = 120.

unsigned factorial (unsigned num) { return num <2 ? 1 : num * factorial (num-1); }

Factorial (n) = n * Factorial (n-1) for all positive values n given Factorial (1) = Factorial (0) = 1. Pseudo-code: Function: factorial, f Argument: positive number, n IF n<=1 THEN RETURN 1 ELSE RETURN n * f(n-1) END IF

Zero factorial is one because n! = n-1! X n. For example: 4! = (4-1) X 4. If zero factorial was zero, that would mean 1! =(1-1) X 1 = 0 X 1=0. Then if 1!=0, then even 999! would equal zero. Therefore, zero factorial equals 1.

It is not except when n = 1.

For any positive integer, n, factorial (n) can be calculated as follows: - if n<2, return 1. - otherwise, return n * factorial (n-1). The algorithm is recursive, where n<2 represents the end-point. Thus for factorial (5) we find the following recursive steps: factorial (5) = 5 * factorial (4) factorial (4) = 4 * factorial (3) factorial (3) = 3 * factorial (2) factorial (2) = 2 * factorial (1) factorial (1) = 1 We've now reached the end-point (1 is less than 2) and the results can now filter back up through the recursions: factorial (2) = 2 * factorial (1) = 2 * 1 = 2 factorial (3) = 3 * factorial (2) = 3 * 2 = 6 factorial (4) = 4 * factorial (3) = 4 * 6 = 24 factorial (5) = 5 * factorial (4) = 5 * 24 = 120 Thus factorial (5) = 120. We can also use a non-recursive algorithm. The factorial of both 0 and 1 is 1 thus we know that the return value will always be at least 1. As such, we can initialise the return value with 1. Then we begin iterations; while 1<n, multiply the return value by n and then subtract 1 from n. We can better represent this algorithm using pseudocode: Function: factorial (n), where n is an integer such that 0<=n. Returns an integer, f. Let f = 1 Repeat while 1<n Let f = f * n Let n = n - 1 End repeat Return f

0!=1! 1=1 The factorial of 0 is 1, not 0

long n, factorial; for (n=1, factorial=1; n <= 10; n++) { factorial *= n; printf ("%d %d\n", n, factorial); }

An example in Java, to compute 10!: int factorial = 1; for(int i = 1; i < 11; i++) { factorial *= i; }

No, that is nothing like a factorial. 4 factorial (written as 4!) is 4*3*2*1 = 24.

145 1! = 1 4! = 24 5! = 120

5 factorial = 5*4*3*2*1 = 120

Zero factorial, written as 0!, equals 1. This is a simple math equation.

#!/bin/sh echo "Enter the number" read num factorial=1 for i in `seq 1 $num` do factorial=`expr $i \* $factorial` done echo $factorial

#!/usr/bin/perl print factorial($ARGV[11]); sub factorial { my($num) = @_; if($num == 1) { return 1; # stop at 1, factorial doesn't multiply times zero } else { return $num * factorial($num - 1); # call factorial function recursively } }

int main() { // Variable declarations. unsigned long int factorial = 1 , number = 1; // reads a number for finding its factorial. cout > number; while( number > 1 ) { factorial *= number * ( number - 1 ); number -= 2; } cout

10! and 6! means factorial of 10, and factorial of 6, respectively. You can calculate that on most scientific calculators - or you can multiply all numbers from 1 to 6 for the factorial of 6, and all numbers from 1 to 10 for the factorial of 10.

The factorial f(n) = n * (n-1) * (n-2) * .. 1. For example factorial 5 (written as 5!) = 5 x 4 x 3 x 2 x 1 = 120. The function below returns the factorial of the parameter n. int factorial( int n) { if (n==1) return 1 else return n* factorial( n-1) ; }

dim num as integer, factorial as single num=inputbox("enter a number") factorial = 1 for x = 1 to num factorial = factorial * x next x print"factorial is" ; factorial or By Recursive Method Private Function FindFactorial(number As Integer) If number < 1 Then FindFactorial = 1 Else FindFactorial = number * FindFactorial(number - 1) End If End Function ' recursive is faster and simpler for finding factorial