Select the correct alternative from the given choices.
There are four executives A, B, C and D each working in a different organization amongst Microsoft, Oracle, Infosys, and IBM, not necessarily in the same order. Each of them gives three replies to any question asked, which are alternately true or false, in any order. When asked to mention the name of the executive and the organization that he works for, they gave the following replies:
A: C works with Microsoft.
D works with IBM.
B works with Infosys.
B: A works with IBM.
C works with Infosys.
D works with Oracle.
C: D works with Microsoft.
B works with Oracle.
A works with Infosys.
D: B is not working with Infosys.
A is working with IBM.
C is not working with Microsoft.
A definite arrangement can be obtained from the above information. Answer the questions based on the above data.
Who among the following works with Microsoft?
Options
A
B
C
D
Solution
Each person alternates between truth and lie, then for three statements given by any person, the nature of the statements could be:
True, False, True
or
False, True, False
(i) Assume that the three statements given by A are in the order True, False, True. Then we get the following arrangement:
I | II | III | Organization | |
A | T | F | T | IBM |
B | T | F | T | Infosys |
C | F | F | F | Microsoft |
D | Oracle |
Here, all the three statements given by C become false, hence, we'll try the second combination.
(ii) Assume that the three statements given by A are in the order False, True, False.
Then we get the following arrangement:
I | II | III | Organization | |
A | F | T | F | (x IBM) Microsoft |
B | F | T | F | (x Infosys) Oracle |
C | F | T | F | (x Microsoft) Infosys |
D | T | F | T | IBM |
Hence, here we get a definite arrangement.
A works with Microsoft