Study the following information carefully and answer the questions given below. Eight boxes namely P, R, S, T, U, M, N and O are placed from top to bottom but not necessarily in the same order. They contain different types of books among Hindi, English, Sanskrit, Math, Science, Physics, Chemistry and Civics. Boxes are of different colours among red, green, black and yellow colour. Exactly two boxes are there of each colour. Consider top as 1st position and so on. The following information is known about them. There is gap of one box between the box T which is green colour and box R and both are in the top 4 positions when boxes are arranged from top to bottom. The box containing Math book is kept immediately below black colour box and is of same colour as T. Box S is kept somewhere between N and O. Box O is below S. The two yellow boxes are kept vertically adjacent to each other. Sanskrit book is kept exactly between M and the box containing Physics book. O doesn't contain Hindi book. There is gap of one box between the box U and box N, which is kept immediately below the box containing Math book. Box U is --below the box N. The box containing Civics book is placed at even numbered place but is not placed at the bottom. The red colour box which is kept at top either contains Hindi or Chemistry book. Box U is not of yellow.colour. Box M which contains Science book is of black colour. The box containing English book is of black colour. S doesn't contain any of Hindi or Civics book. Which box is placed at 8th position?