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x!<=10^10 -1

Guest May 6, 2017
 #1
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x!<=10^10 -1

 

10^10 = 10 000 000 000

10^10-1=9 999 999 999

 

10! = 3628800

12! = 479 001 600

13! = 6 227 020 800

14! = 87 178 291 200

 

so 

\(x\le 13\)

Melody  May 6, 2017

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