juantheron
				
				
			 
			
	
	
	
		
	
	
			
		
		
			
			
				
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If $A = \left\{1,2,3,4,5\right\}$. Then total number of function from $A$ to $A$ 
for which $f(f(x)) = x$
				
			for which $f(f(x)) = x$
jacks said:If $A = \left\{1,2,3,4,5\right\}$. Then total number of function from $A$ to $A$
for which $f(f(x)) = x$