Four words are given, out of which three are same in a certain way while the…

Concept: In this type of classification question, three of the four given words share one common category, while the odd one fails to fit that same category.

Application: Delhi, Mumbai, and Kolkata are all cities located within India: Delhi is the National Capital Territory, Mumbai is the capital of Maharashtra, and Kolkata is the capital of West Bengal. Rangoon (now called Yangon) is not in India; it is a city in Myanmar (Burma), where it served as the national capital until 2006.

Cross-check: Checking each city's location independently confirms the pattern: three of the four sit within India, while Rangoon lies entirely outside it, so the shared category ("located in India") holds for only three of the four words.

Result: Rangoon is therefore the different word among the four.