A king’s durbar consists of a knight, a spy and a knave.
Knight speaks only truth, spy can speak either a truth or a lie and the knave speaks only lies.
From the following statements made by 3 people A, B and C comprising the knight, spy and knave though not necessarily in that order, identify the spy.
A: I am knight. B : A is not knave. C: If you had asked me, I would say A is the spy.
Explanation:
Assuming,
Case 1: A is the knight ⇒ B and C can be spy or knave.
This fits wells with statements made by B and C.
Case 2: B is the knight ⇒ A is spy and C is knave.
This fits wells with statements made by A and C.
Case 3: A is the knight ⇒ A is spy and B is knave.
This contradicts statement made by B.
∴ Based on case 1 and 2, any three of them can be the spy.
Hence, option (d).
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