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What is the condition for an equivalence relation if two cities are related within a country?

(a) the two cities should have a one-way connection

(b) the two cities should have a two-way connection

(c) the two cities should be in different countries

(d) no equivalence relation will exist between two cities

My enquiry is from Trees topic in portion Trees of Data Structures & Algorithms I

I have been asked this question in semester exam.

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Right answer is (b) the two cities should have a two-way connection

The best I can explain: If the two towns are in the same country and have a two-way road connection between them, it satisfies equivalence property.

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