Four books P, Q, R and S are placed on a table. R is placed immediately above Q and S is placed immediately below P. R is not at the top. Which book is at the bottom?
Question and options
Four books P, Q, R and S are placed on a table. R is placed immediately above Q and S is placed immediately below P. R is not at the top. Which book is at the bottom?
- P
- Q
- R
- S
Answer and explanation
Correct answer: B - Q
The stack is made of the pairs R-Q (R directly on Q) and P-S (S directly under P). Since R is not at the top, P-S must be above R-Q, giving P, S, R, Q from the top. Q is at the bottom.
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CUSAT CAT Five-Year LL.B.
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