In the following question on classification of games, four games are listed (Ludo, Chess, Polo and Carrom). Three are indoor board games, while one is an outdoor field sport played on horseback. Select the odd word from the given alternatives.

Introduction / Context:
This verbal reasoning question deals with the classification of games. You are given four game names: Ludo, Chess, Polo and Carrom. In odd man out questions, three items usually share a common feature, while one item belongs to a different category. Here the common feature is whether the game is an indoor board game or an outdoor sport requiring a large field and specialised equipment like horses.

Given Data / Assumptions:

• Ludo: a board game played indoors on a printed board with tokens and dice.
• Chess: a strategic indoor board game with pieces on a chequered board.
• Polo: an outdoor team sport played on horseback with mallets and a ball.
• Carrom: an indoor tabletop board game played by striking discs.
• Exactly one game is a field based outdoor sport; the others are board or tabletop games usually played indoors.

Concept / Approach:
The core idea here is to classify games according to where and how they are played. Board and tabletop games are usually played indoors on a small surface and do not require large grounds or animals. Field sports, on the other hand, need open spaces, many players and special gear. By checking each option against these characteristics, you can quickly identify which one does not fit the majority group.

Step-by-Step Solution:
Step 1: Analyse Ludo.Ludo is a simple indoor board game played on a cross shaped board using dice and coloured pieces. It clearly belongs to the board game category.Step 2: Analyse Chess.Chess is also an indoor board game played on a 8 by 8 chequered board using black and white pieces. It is a classic example of an indoor mind sport.Step 3: Analyse Carrom.Carrom is an indoor tabletop board game. Players flick a striker to move small discs into corner pockets. It is again played on a flat indoor surface.Step 4: Analyse Polo.Polo is a fast outdoor team sport. It is played on horseback on a large grass field with long mallets and a small ball. It is very different from table or board games.Step 5: Identify the odd game.Since Ludo, Chess and Carrom are all indoor board or tabletop games, while Polo is an outdoor equestrian sport, Polo is the odd word in the list.

Verification / Alternative check:
You can also ask a simple practical question: if there is a power cut or limited space indoors, which of these games cannot reasonably be played in the living room? Ludo, Chess and Carrom can all be played on a table at home. Polo requires horses, a large field and specialised safety arrangements, so it clearly stands apart. This thinking confirms your earlier conclusion about the odd one out.

Why Other Options Are Wrong:
Ludo: Indoor board game, similar in nature to other tabletop games, so not the odd one.
Chess: Another indoor board game, matching Ludo and Carrom.
Carrom: Indoor tabletop game, again belonging to the same broad group.

Common Pitfalls:
Sometimes candidates are tempted to overcomplicate the problem by considering whether each game uses a ball, or whether it is a team game or an individual game. While these differences exist, the intended exam pattern usually focuses on the most obvious classification, which is indoor board game versus outdoor field sport. Focusing on the simplest strong grouping helps avoid confusion and saves time.

Final Answer:
The odd word is Polo, because Ludo, Chess and Carrom are indoor board or tabletop games, whereas Polo is an outdoor field sport played on horseback.