Solution: Namcha Barwa mountain peak is located in Tibet (China). So it is not located in Garhwal Himalaya. There are two peak named as Nanda Devi mountain peak - Nanda Devi main (7816 m) and Nanda Devi East (7434 m). Of these, Nanda Devi is situated in West Chamoli district, which is the peak of the Garhwal Himalaya Mountains, while Nanda Devi located on the border of East Chamoli, Pithoragarh and Bageshwar districts, which is the peak of the Kumaon Himalaya Mountains. Since only Nanda Devi Shikhar has been asked in the question. Hence pair 2 is correctly matched. According to Sidney Burrard's regional division of the Himalayas, Nanda Devi is also a mountain peak of the Kumaon Himalayas. Nokrek peak is the highest peak of the Garo hill (Meghalaya) range. It is not the peak of the Sikkim Himalayas.