- AR
- BP
- CQ
- DW
Step-by-Step Solution
S=1, T=8. The block Q, R, W, P sits on consecutive floors; testing shows R=5 (Q=4, W=6, P=7), leaving V=3, U=2. Top to bottom: T, P, W, R, Q, V, U, S. Floor 5 is R.
Answer: A) R
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