+0  
 
0
63
1
avatar

The positive integer x satisfies (10! + 11! + 12!)/10! = x^2.  Find x.

 Jun 12, 2020
 #1
avatar
0

 (10! + 11! + 12!)/10! = x^2

144 = x^2

Take the square root of both sides:

x = 12

 Jun 12, 2020

9 Online Users

avatar