AQuA-RAT train #27066 · Algebra · Algebra word problems

There are 28 stations between Kolkatta and Chennai

There are 28 stations between Kolkatta and Chennai. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #27066

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