With reference to river Teesta, consider the following statements : 1. The source of river Teesta is the same as that of Brahmaputra but it flows through Sikkim. 2. River Rangeet originates in Sikkim and it is a tributary of river Teesta. 3. River Teesta flows into Bay of Bengal on the border of India and Bangladesh. Which of the statements given above is/are correct ?

Statement 2 is correct because the Rangeet River originates from the Rathong Glacier in Sikkim and is the largest tributary of the Teesta, joining it at Melli. Statement 1 is incorrect because the Teesta originates from the Tso Lhamo Lake/Pahunri glacier in Sikkim, whereas the Brahmaputra originates from the Chemayungdung glacier in Tibet. Statement 3 is also false as the Teesta does not flow into the Bay of Bengal directly; it joins the Brahmaputra (Jamuna) in Bangladesh. The core concept being tested is the drainage system of North-East India, specifically the precise origins, tributaries, and confluence points of Himalayan rivers.