Knights, Knaves and Jokers on an island
Suppose you are visiting an island in which there are only 3 kinds of people :
- Knights- they speak only the truth
- Knaves - they only lie
- Jokers - they can do either
Now when you come to island, you see 4 people (A,B,C,D) and suppose you know that among those 4 there is atleast one of each kind. You ask them 3 questions :
| Person | A | B | C | D |
| Q1: How many of you are Knights ? | 2 | 2 | 1 | 1 |
| Q2: How many of you are Knaves ? | 1 | 1 | 1 | 2 |
| Q3: How many of you are Jokers ? | 1 | 1 | 1 | 2 |
Now my question is tell me who is/are the Knight(s) ?
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Out of A , B , C , and D , only A and B would have possible statements if they were k n i g h t s , as they would be the only members that would give values that sum four (seeing there are four people on the island).
For determining C and D (not needed):
Either C or D must be a j o k e r , and the other must be a k n a v e .
C could only be a j o k e as they give a false value (1 k n i g h t ) and two true values (1 j o k e r and 1 k n a v e ). D is therefore the k n a v e .