Ranking and Ordering Arrangements

 Ranking and Ordering Arrangements

 

Order and Ranking is an important logical reasoning chapter where the position or rank of a person from left/right or top/bottom in a row or column is to be determined. Also, the total number of persons is to be calculated according to the given position.

 

1. The total number of a person/objects in a group or class is equal to one less than the sum of the positions of the same person from both the ends (either right and left or top and bottom). Since the same person is counted twice in the sum, the final answer is one less than the total sum.

2. The total number of person/object in a group is the sum of before or after the given person in a row and the position of the same person from the other side.

Total no. of persons/objects = No. of persons/objects before or after the given person in a row + Position of the same person from the other side.

An orderly arrangement of pencils in a linear way.

3. If the positions of two objects/persons are given from the opposite ends and also the total number of persons/objects, then the problem can be addressed in two different ways to determine the number of persons between these two persons/objects.

Case 1:

Overlapping:

The total number of objects or persons in a group is always lesser than the addition of the position of two objects or persons from ends. 

Case 2:

Non – overlapping:

The total number of objects or persons in a group is always greater than the addition of the position of two objects or persons from ends.

 4. If the data in the question provides only then information of position different objects or persons then it is impossible to find the total number of objects or people in a group or class. As the cases can either be an overlapping or non-overlapping one. In such a situation, the final answer will always be found. Save the time by not trying to solve these type of questions.

5. Swapping of position to find the order/ ranking

In this section, the placement or the position of the two objects/persons are interchanged. The position of the two people or objects is examined before and after the interchanged.

The place value or the position of the second person from the same side as before interchanging = Position of 2nd person from the same side before interchanging + (Position of 1st person after interchanging – position of 1st person before interchanging from the same side)

6. If positions of two objects from opposite sides of the row are known there is a third object right in the middle of the two, then the total number of objects can be evaluated based on the position of the third object.

Case 1:

The position of the third object is known from both the sides

Case 2:

The position of the third object is known from either of the sides.

7. 

To find the minimum number of members in the group.

The Minimum number of persons = Sum of positions of persons from both sides – Persons between them – 2.

 

 

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