Chords PQ and RS of a circle extended externally intersect at point T. Length of the segment PT, if lengths of QT, RT and ST are 9 cm, 18 cm and 6 cm respectively, is
In 1782 Colebrooke was appointed through his father's influence to a writer-ship with the East a India Company in Calcutta.Lord Wellesley appointed him honorary professor of Hindu law and Sanskrit at the college of Fort William.