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In a row of people, Marshall is sitting 13th from the left end and 36th from the right end. What is the total number of persons in the row?
49
46
48
50
48
In a row, if a person's rank from both ends is known (Left + Right), total number of persons = (Left Rank + Right Rank) - 1.
In a row, if a person's rank from both ends is known (Left + Right), total number of persons = (Left Rank + Right Rank) - 1.
Analyze the given data
Marshall is 13th from the left (L = 13) and 36th from the right (R = 36).
Apply the ranking formula
The formula to find the total number of persons in a row when one person's position from both ends is known is: Total = (Position from Left + Position from Right) - 1. We subtract 1 because Marshall is counted twice (once in each direction).
Calculate the result
Total = (13 + 36) - 1 = 49 - 1 = 48.
A: 49 is obtained by just adding 13 and 36 without subtracting the overlap. B: 46 is mathematically incorrect. D: 50 is obtained by adding 1 instead of subtracting.
C is correct because the sum of the positions from both ends minus one (13 + 36 - 1) equals 48, which is the total count of persons in the row.
Always remember the '-1' rule in ranking problems when the same person is counted from both sides. If the problem asks for the number of people BETWEEN two people, the logic differs (e.g., |L1 - L2| - 1).
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