Question

Six students, P, Q, R, S, T and U have been instructed

Q: Six students, P, Q, R, S, T and U have been instructed to keep their books on six different shelves

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to keep their books on six different shelves of a bookshelf having only six shelves one over the other. Books of S are kept on the topmost shelf. Books of P and U are kept on third shelves from the extreme top and extreme bottom, respectively. Only books of R are kept between the shelves containing books of U and Q. Books of student T are kept on which shelf from the extreme top?

A 4th

B 2nd

C 1st

D 3rd