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February 17th, 2017, 03:24 PM  #1 
Newbie Joined: Dec 2016 From: Venezuela Posts: 4 Thanks: 0  How to solve this problem?
Sergio wrote five different positive integers, one digit each, on the board. He discovered that no sum of two of the numbers written is equal to 10. Which of the following numbers can be assured that it was written by Sergio? A:1 B:5 C:2 D:4 E:3 
February 17th, 2017, 03:41 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,947 Thanks: 1555 
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