Latest TCS Aptitude Question SOLUTION: A girl got stuck on an island. There are only 3 members on the island. 1 knight, 1 knave and 1 spy. Knight always speaks truth, Knave always speaks false and spy can speaks either

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(#M40155046) TCS Logical Reasoning question Puzzle Keep an EYE

A girl got stuck on an island.
There are only 3 members on the island.
1 knight, 1 knave and 1 spy.
Knight always speaks truth, Knave always speaks false and spy can speaks either true or false.
Girl approaches to all three of them and get reply from all of them.

A told "I am Knight".
B told "I am Knave"
C told "B is Knight".

Then who is A?

Option:
a. Knight
b. Knave
c. Spy
d. Can't able to say.

Asked In TCS Sourabh Prasad (8 years ago)

Unsolved Read Solution (11)

Is this Puzzle helpful?   (18)   (7) Submit Your Solution General Mental Ability

Read Solution (11) :

shraddha gupta  (8 years ago)

conditions are
A told C is knight
B told C is Spy
C told B is spy

according to me ...
A must be "Knave" Because Knave satisfied the condition ..
if A is "knave".. then it says always False .. so C is not Knight means C is "Spy"

And B will be "Knight" (bcs A is Knave n C is Spy)..who always say truth "C is Spy" (condition Satisfied by first nd scnd statement)

C Can speak true Or false ..so c is false that B is spy

Is this solution Helpfull? Yes (10) | No (3)  

Ankita  (8 years ago)

Answer : A is Knight
Proof:
According to C if "B is Knight" then B might had not lied.
i.e. B & C both are liars.
According to question only one person speaks true i.e. knight
So A is Knight ..............................................................................Answer

Is this solution Helpfull? Yes (4) | No (1)  

SHARIQUE SERAJ  (8 years ago)

though it was not fully this ques only u r leaving some part of it..but d ans wud be a.knight

Is this solution Helpfull? Yes (2) | No (2)  

abhinav shrivastava  (8 years ago)

there are 6 conditions possible:-
A= knight, B = knave, C = spy
A= knight, B = spy, C = knave
B= knight, A= knave, C = spy
B= knight, A= spy, C = Knave
C= knight, A= knave, C = spy
C= knight, A= SPy, C = Knave

now check the conditions for each of them being true or false,
we will get only condition left as
A = knight, B = Spy C = Knave

Is this solution Helpfull? Yes (2) | No (1)  

nagaraj  (8 years ago)

i feel its cant be determined...

Is this solution Helpfull? Yes (1) | No (3)  

Vedant Pandya  (8 years ago)

answer is a.knight

Is this solution Helpfull? Yes (1) | No   

KrishnaPriyanka Badam  (8 years ago)

conditions are

A told C is knight
B told C is Spy
C told B is spy

who is A??

can anyone pls answer for this......

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kavita vetal  (8 years ago)

Cant BLE TO SAY

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Abhinav Tiwari  (8 years ago)

Ans will be a. Knight

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pooja kumari  (8 years ago)

ans is Knight

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Aarthna Maheshwari  (8 years ago)

To speak the truth person has to be knight. therefore B being the knight rules out also since c says b is knight then automatically rules out that the fact that he is saying the truth so A is knight. Also now to determine which is knave and spy:
since B tells I am knave and knave always lies so B is a spy and which automatically makes as Knave.

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