What is n!1!(n−1)!where n is a positive integer?

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Lesson Parent: 
The Factorial Function
Problem: 

What is
n!1!(n−1)!where n is a positive integer?

Answer: 

n!1!(n−1)!=n

SAMPLE SOLUTION

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Solution: 

First, we know that 1!=1 and <Sign in to see all the formulas> so we have

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