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$\begingroup$ If A saw 4, wouldn't he only know that his number must be 3 or 4? How does he for sure know it's 4. $\endgroup$

mchoy25
– mchoy25

2016-02-19 17:58:36 +00:00
Commented Feb 19, 2016 at 17:58
$\begingroup$ If his number was 3 (or any prime), B would necessarily know that his own was 4 (or $A+1$) since the only option for the two positive integers added or multiplied are $A$ and $1$. $\endgroup$

Matt
– Matt

2016-02-19 18:00:02 +00:00
Commented Feb 19, 2016 at 18:00
$\begingroup$ Hmm. I think I got distracted in the midst of writing my answer. I will edit it. Thank you. $\endgroup$

Solocutor
– Solocutor

2016-02-19 18:00:52 +00:00
Commented Feb 19, 2016 at 18:00

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