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February 17th, 2017, 03:24 PM   #1
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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
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February 17th, 2017, 03:41 PM   #2
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