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Eight people P-W live on floors 1 (ground) to 8. R is on floor 3. Two persons live between R and V. W is immediately above Q. One person lives between T and U, with T above U. One person lives between R and S, and S is below T. How many persons live between Q and U?
AThree
BFour
CTwo
DNone
Answer & Solution
Correct answer: B. Four
1. The unique arrangement is 1-S, 2-U, 3-R, 4-T, 5-P, 6-V, 7-Q, 8-W.
2. U is on floor 2 and Q is on floor 7.
3. Floors 3, 4, 5, 6 lie between them — that is **four** persons.
_Source: IBPS RRB Officer Scale I Prelims PYQ (Examrace), Q.28_