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# what is fictorial ?

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whay  fictorial is used and also give the proof of 0!=1

#1
+80983
+5

The term is "factorial".....it represents the product of the first "n" positive integers and is written as n!

Thus,

3! = The product of the first three positive integers = 3*2*1 = 6

And 5! = The product of the first five positive integers = 5*4*3*2*1 = 120

This idea is used quite frequently in the areas of probability and statistics to count sets or orderings of things.

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Proof that...... (0! = 1).......while not a "formal" proof, here's the idea........

`3! = 3*2*12! = 2*1 = (3*2*1)/3 = 3!/31! = (2*1)/2 = 2!/2Then.....0! = 1!/1 = 1   `
CPhill  Jun 3, 2014
Sort:

#1
+80983
+5

The term is "factorial".....it represents the product of the first "n" positive integers and is written as n!

Thus,

3! = The product of the first three positive integers = 3*2*1 = 6

And 5! = The product of the first five positive integers = 5*4*3*2*1 = 120

This idea is used quite frequently in the areas of probability and statistics to count sets or orderings of things.

------------------------------------------------------------------------------------------------------

Proof that...... (0! = 1).......while not a "formal" proof, here's the idea........

`3! = 3*2*12! = 2*1 = (3*2*1)/3 = 3!/31! = (2*1)/2 = 2!/2Then.....0! = 1!/1 = 1   `
CPhill  Jun 3, 2014
#2
+91448
0

Thanks Chris.

A neat little demonstration.

Melody  Jun 4, 2014

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