Which one of the following is NOT a pair of North Eastern states of India?

The correct answer is Assam and Bhutan . Key Points Northeast India is the easternmost region of India representing both a geographic and political-administrative division of the country. It comprises eight states: Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, and Tripura. It is linked with the Indian heartland through the 21 km wide Siliguri Corridor , which is commonly known as the chicken neck, created by the Radcliffe line . Mistake Points Bhutan is a country and not a state of India.