18) A king’s durbar consists of a knight, a spy & a knave. knight speaks only truth, spy can speak either a truth or a lie & the knave speaks only lies. From the following statements made by 3 people A, B & C comprising knight, spy & knave not in same order. Identify the spy.
A Said “I am knight”.
B Said “A is not knave”.
C Said “If you had a asked me, I would say A is the spy”.

• Assume A is KNIGHT , B says A is not KNAVE which is also right so B is SPY and C is naturally KNAVE and he gives a false statement.
  Now assume B is KNIGHT , A cud b either SPY or KNAVE but if he is a spy then the statement of C who wud be KNAVE is true which is not possible so A has to b KNAVE which makes C the SPY but again the truthful KNIGHT says A is not KNAVE so this condition not true either.
  Again assume C is the KNIGHT and he says A is the SPY which makes B the KNAVE and he says A is not KNAVE which is true thus contradicting his natural talent to lie so this condition is also not possible
  Thus we do have an answer for this question which is B
• 11 years agoHelpfull: Yes(27) No(1)
• knight-C
  spy -A
  knavea-B
  
• 11 years agoHelpfull: Yes(3) No(11)
• a spy can be B bcoz
  1st suppose A is telling the truth thn A-knight(bcoz knight speaks truth),nw B is saying A is not a knave thn he is also telling the truth(n it can be spy bcoz spy can either lie or saying the truth),thn C is saying that A is a spy nd it is nt true(so C is knave)
• 11 years agoHelpfull: Yes(3) No(0)
• A=Knight B= spy C =knave ... knight always sy truth so if A is knight so inorder to make A knight B has to be spy so that B tells truth about A that he is not knave ans then c would definately be knave
• 11 years agoHelpfull: Yes(3) No(1)
• this is dummy question... in tcs and no solution for this question
• 11 years agoHelpfull: Yes(2) No(12)
• no solution possible
  
• 9 years agoHelpfull: Yes(2) No(2)
• Assume the condition:
  case (i) :
  A=Knight
  then, B's statement is right that "A is not knave"
  obviously B vl b d SPY and C will b the KNAVE.
  case (ii)
  B=KNIGHT
  then he says " A is not knave"..so A becomes spy and C d knave
  but note c says A is d spy...if he s d knave he cant speak truth...therefore this condition is impossible.
  case (iii)
  C= KNIGHT
  he says " A is the spy "
  so A will b spy and B will be knave
  but note b's statement...what he said was true..tat A is not knave...so B cant be knave (bcoz knave lie)
  this condition is impossible.
  
  therefore the spy will be "B"
  
• 8 years agoHelpfull: Yes(1) No(0)
• anjali kindly explain the logic
• 11 years agoHelpfull: Yes(0) No(1)
• i have an answer for u all buddies
  taking A as spy and he is telling lie
  acc to this C will be knight as he always say truth and lier is knave i.e B
  
• 11 years agoHelpfull: Yes(0) No(3)