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$\begingroup$ You do not know who is who, that's the main problem. Nice try. $\endgroup$
– Andrii Chumakov
Commented Apr 16, 2019 at 18:17
8

$\begingroup$ @Andrii If I understand Hermes' answer correctly all three will give the same answer, so it doesn't really matter who is who $\endgroup$
– Vincent
Commented Apr 17, 2019 at 8:47
$\begingroup$ The stone can be used only once. You can't ask all three guards with it. $\endgroup$
– Daniel P
Commented Apr 17, 2019 at 16:20
1

$\begingroup$ I'm not asking all three: only one, at random. Whoever he is, the answer will be the same. $\endgroup$
– Hermes
Commented Apr 17, 2019 at 16:22

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