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Which of the following states shares the longest boundary with China?

Solution

✅ Correct Option: 2

Among the given options Arunachal Pradesh has the longest border with China, roughly 1126 km along the McMahon Line. Uttarakhand, Himachal Pradesh and Sikkim share much shorter stretches. The Union Territory of Ladakh has a longer boundary but is not a state and is not listed here.

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