Five books — P, Q, R, S, T — are placed in a single vertical stack. P is placed somewhere above Q. R is placed somewhere below Q. S is at the very top. T is placed just below S. Which book is at the bottom of the stack?

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R. S is top and T just below it. The remaining P, Q, R fill the lower three positions with P above Q above R. Final (top to bottom): S, T, P, Q, R. The bottom book is R.

Five books — P, Q, R, S, T — are placed in a single vertical stack. P is placed somewhere above Q. R is placed somewhere below Q. S is at the very top. T is placed just below S. Which book is at the bottom of the stack?

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