X-is-a-person-that-can-only-one-of-these-a-only-tell-truth-b-only-tell-lie-using-a-minimal-number-of-question-how-to-discover-what-type-of-people-are-X-

Question Number 902 by 123456 last updated on 18/Apr/15

X is a person that can only one of these

a . only tell truth

b . only tell lie

using a minimal number of question

how to discover what type of people

are X ?

Answered by prakash jain last updated on 18/Apr/15

Only one question is needed .

Q : If I ask you^{'} Do you speak {Truth}^{'} will

you say^{'} {yes}^{'} ?

If X speak truth :

Answer to Q will be yes .

If X lies

Answer to Q no .