Master this topic with zero to advance depth.
Order and Ranking tests your ability to determine the position of a person or object in a row, queue, or vertical stack.
Fundamental Rules:
тАв Total Persons (T): If a person's position is known from both the Left (L) and the Right (R) ends, then T = (L + R) - 1 (We subtract 1 because the person is counted twice).
тАв Position from another end: If Total (T) and position from Left (L) are known, then position from Right (R) is R = (T - L) + 1.
Always draw a horizontal line and mark relative positions.
тАв Finding people between two persons: If A is L from left, B is R from right, and Total (T) is given.
Case 1 (Non-Overlapping/Simple): If T > (L + R), then Number of people between them = T - (L + R).
Case 2 (Overlapping/Crossing): If T < (L + R), then Number of people between them = (L + R) - T - 2.
When two persons swap their positions, use this 5-second trick to find the Total in the row:
Trick: New position of 1st Person + Old position of 2nd Person - 1.
Example: A is 10th from Left. B is 15th from Right. They interchange, and A becomes 20th from Left. Total = New A(20) + Old B(15) - 1 = 34.
In Mains exams, Ranking is often merged with Ratio/Proportions or Data Sufficiency.
тАв If 'Girls are twice the Boys', first separate the total into exact numbers (e.g., in 60 students: 40 Girls, 20 Boys).
тАв Shifting logic: If A shifts 4 places to his Right, his rank from Left increases by 4, but his rank from Right decreases by 4.
тАв Maximum vs Minimum: If a question asks for the 'minimum' number of persons, ALWAYS check the overlapping case first.