Which among the following states is not of the "seven sisters" of India?

The "seven sisters" states of India are Assam, Arunachal Pradesh, Nagaland, Manipur, Tripura, Meghalaya and Mizoram. Sikkim is not one of the seven sisters. State Capital Chief Minister Governor Tripura Agartala Manik Saha Satyadev Narayan Arya Sikkim Gangtok Prem Singh Tamang Ganga Prasad Assam Dispur Himanta Biswa Sarma Jagdish Mukhi Meghalaya Shillong Conrad Kongkal Sangma Tathagata Roy Mizoram Aizawl Zoramthanga P S Sreedharan Pillai