Refer to the following letter, number, symbol series and answer the question.
(Left) H ^ 2 K L 4 D & 3 $ D @ 5 7 % J B # S (Right)
How many such symbols are there which are immediately preceded by a letter and also immediately followed by a number?
Five friends P, Q, R, S, and T live in a five-storeyed building numbered from 1 (lowest floor) to 5 (topmost floor). Each of them lives on a different floor of the building. R lives on the floor below Q’s floor. T does not live on the top floor. There are an equal number of people living above and below the floor on which S lives. Two people live between the floors where T and R live. Q does not live above or below the floor where S lives. Who lives on the second floor?