Free Online Preparation for CAT with Minglebox e-CAT Prep. Cover basic concepts of Logical Connectives under Data Interpretation for MBA Entrance Exam Preparation with Study material, solved examples and tests prepared by CAT coaching experts.
What is a logic Problem ?
A logic problem aims to test your ability to co organize a given set of information and deduce facts there from that set of information.
For example if a clue says “Rita always takes her lunch to school, while singh eats in the canteen.” It is clear that Rita is not singh, as in most clues, when two people are mentioned, one by first name and one by surname, it is safe to assume that they are not the same person. Let us take another clue “ Rita, Singh and the girl with hazel colored eyes had their lunch an hour earlier than other members of the office”; we can infer that there are 3 different persons Rita, Singh and the girl with hazel colored eyes. However if the clue says “ The woman with the red hair (who isn't Rita) taken her lunch hour before miss Singh”. Then we know that Ms. Singh does'nt have red hair, but we don't know if Rita is Miss Singh or not.
Let us consider an example to illustrate this let us consider an example.
A game of message passing was being played amongst 7 people standing in arow, viz. Ramesh, Rama, Ram,Shyam, Shyama,Sita and Sarita, not Necessarily in that order. Certain other facts are also known Shyam passed the message to Shyama who was in queue before Rama. Ramesh could only give message while Rama could only accept. Ram and Shyam cannot be next to each other. Sita does not take message from Ramesh.
How many combinations are possible with respect to the seating arrangement amongst Ram, Sarita and Sita, the other conditions being the same ?
From the condition given Ramesh could only give message and Rama could only accept & Ramesh is the first person in the queue and Rama is the last. Also it is given the Shyam passed the message to Shyama who was the 6 th person in the Queue, while Shyam was the 5 th person in the queue. Ram and Shyam cannot be next to each other so Ram cannot be at the 4 th position so he would either be at 2 nd position or the 3 rd position. Similarly, it is stated that sita does not take message from Ramesh so she would be either at the 3 rd or the 4 th position
Thus following arrangement can be made
1 2 3 4 5 6 7
Ramesh Shyam Shyama Rama
Now according to the given condition 3 combinations are possible, satisfying the conditions that Ram is not next to Shyam and Sita is not accepting message from Ramesh.
In the 1 st case Ram can occupy the 2 nd position, Sarita 3 rd while Sita 4 th. In the second case Sarita can occupy 2 nd position, Ram 3 rd and sita 4 th.
In the 3 rd case, Ram can occupy 2 nd position, Sita 3 rd and Sarita 4 th. Hence option (3) is the right answer.