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There is a hint for part B, but I do not get which ones are the right cases to get rid of both goblins. Thanks!

How can I tell who is a truth teller and who is a liar?

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  • $\begingroup$ It's only a hint. It's not a complete solution. Keep thinking. It's not an easy problem, but eventually you'll get it. $\endgroup$ – Yuval Filmus Feb 23 '15 at 6:26
  • $\begingroup$ This should be a comment beneath the answer you don't get. (I realize that you have to earn some rep before you can comment.) $\endgroup$ – Raphael Feb 23 '15 at 7:33

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