Question
Six persons, M, N, O, P, Q and R live in a building,
which has six floors. The floor, which is at the bottom, is numbered as 1, the floor above it as 2 and so on. N lives three floors above M. N does not live on the topmost floor. O lives two floors above P. P lives on a prime numbered floor. Q lives above R. How many person/persons live between Q and R?Solution
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