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Thank you for your question.
Your fertile days based on the first date of the LMP that you have provided are: May 6 to May 14, 2016
The chances of Mr. B being the father is much more likely than Mr. A as Mr. A falls in the margin i.e. on 6th of May.
So, Mr. B is most likely the father.
The chances of Mr. A being the father are still around 10%.
The only way, obviously, to be sure about this is to do DNA paternity testing.
Let me know if you have more questions.
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It is not possible to get a 100% accurate answer based on just the information that you have given as sex with both was done too close to each other but what I can say is that there is a 90% chance that B is the father of the child.
Sorry for responding late.
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