Study Notes on Binary Logics

By Gaurav Mohanty|Updated : December 15th, 2021

When you’re dealing with questions from Binary Logics, start with people who say ‘I am the liar’ for this has to be false lest it be a paradox, the next statement hence has to be true. In this way, you could eliminate a contender for ‘liar’ and also get an additional true statement as a bonus.

A, B and C are three people who tell the truth, who alternate, and who lie always not necessarily in that order. Find out who is the alternator from the following statements:
A: B is the liar. I am the truth-teller
B: A is the liar. I am the truth-teller
C: I am the liar. A is the truth-teller.
Options: a. A, b. B, c. C, d. Cannot be determined
It has to be C, I am a liar cannot be true as it becomes a paradox and the next statement should be true hence.
Because of the above statement, A becomes the truth-teller and hence B becomes the liar.

BBA Entrance Exam 2022 promises to be one test that will test every aspirant's mettle. Irrespective of a student's strengths practice is inevitable to reach success here. Today's post will carry one set providing practice for the Logical Reasoning section: Binary Logic!

In a country, there are categories of persons – truth-tellers, liars, and alternators. P met three people, H, B, and C from that country. Each of these belongs to a different category and made the following statements –
H – City X is 30 km to the North of City Y. I am a liar.
B – City W is 50 km away to the West of City Z. City M is 50 km away to the south of city W.
C – City Y is not to the west of city z. H is a truth-teller.

Puzzle 1

In which direction is city X with respect to city M?

a. Northeast

b. Northwest

c. North

d. Cannot be determined

Puzzle 2

If the distance between city Y and city Z is 10 km, then how far is city W from city X?

a. 30

b. 50

c. 30*sqrt (5)

d. 40*sqrt (5)

Puzzle 3

Who among the following is the truth-teller?

a. H

b. B

c. C

d. Either B or C


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