MEDAL AND FAN!!!!!
Cynthia made the conjecture that the sum of any prime number and any composite number is a composite number.

Which equation is a counterexample to her conjecture?

A.

11 + 9 = 20

B.

13 + 2 = 15

C.

11 + 2 = 13

D.

5 + 8 = 13

Question

MEDAL AND FAN!!!!!
Cynthia made the conjecture that the sum of any prime number and any composite number is a composite number.

 

Which equation is a counterexample to her conjecture?
  
 
 

 
 

  

  A. 
 
11 + 9 = 20
   
   

 
 

  

  B. 
 
13 + 2 = 15
   
   

 
 

  

  C. 
 
11 + 2 = 13
   
   

 
 

  

  D. 
 
5 + 8 = 13

anonymous · Answer

haven't done this in 7 years so I naturally go to this site