   A always says Truth, B always lies, C sometimes lies and D is deaf & dumb. Max questions need to ask to determine ABCD?

796 views

Consider that,

A – always says Truth
B – always lies
C – sometimes lies
D – deaf and dumb

What is maximum questions you need to ask each to determine who is ABCD? posted Jun 23, 2017

–1 vote

Ask a question who sometimes lie you will get the answer as A point to C , B point (A ,C, D),C point (A,B,C,D),D is deaf and dumb
So ask only one questions. answer Jul 20, 2017 by anonymous
But how from the above question we can decide who is A, B, C & D. Remember you dont know who is A, B, C and D.
A would say 'Truth' to everything, so ask them if they are A.
B if asked if they were A would lie and say yes, showing they are not.
C ask them the same question, are they A? if they say yes ask again and if they say no they're C.
D just won't hear you so won't be able to answer.
So if you can address them all, it should be at a minimum of 2, as C and B would need to be asked individually.

Similar Puzzles

If blue rectangle area is equal to the sum of 3 squares areas combined as in image, what is relation between a,b,c & d? There is a four-digit number ABCD, where A, B, C, D each represents a different digit from 1 to 9.

If ABCD is divisible by 13, BCDA is divisible by 11, CDAB is divisible by 9, and DABC is divisible by 7, what is the original number ABCD?

+1 vote

If
A x 4 = E
B ÷ 4 = E
C + 4 = E
D - 4 = E
A + B + C + D = 100

Challenge
What is the value of E ?