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Fifteen friends who study in the same class but in different sections. They study in 3 sections L, M and N in such a way that only five study in one section. L is the section for science students, M is for commerce students and N is for arts students. They also live in the same apartment on seven different floors of a building, but not necessarily in the same order. The lowermost floor of the building is numbered one; the one above it is number two and so on till the topmost floor is number seven. Two friends live on each floor and three friends live on ground floor. One floor of them is of different colour.
All friends are sitting in an examination hall. In the examination room, fifteen examinees are seated in 3 columns and five rows. Every column has papers having the same alphabet in it labeled L, M and N according to their section. The section L is sitting in 1column, section M is sitting in 2 columns and the section N is sitting in column 3. 15 question papers

All friends are sitting in an examination hall. In the examination room, fifteen examinees are seated in 3 columns and five rows. Every column has papers having the same alphabet in it labeled L, M and N according to their section. The section L is sitting in 1column, section M is sitting in 2 columns and the section N is sitting in column 3. 15 question papers

L₁, L2, L3, L4, L5, M₁, M2, M3, M4, M5, N1, N2, N3, N4 and N5 are distributed among the examinees such that each examinee receives exactly one question paper, Papers of L code distribute in column 1, papers of M code distribute in column 2 and Papers of N code distribute in Column 3. The fifteen examinees are given code numbers X1, X2, X3, X4, X5, Y1, Y2, Y3, Y4, Y5, Z1, Z2, Z3, Z4 and Z5. X codes for 1 column, Y codes for 2 column and Z codes for 3 columns respectively. It is observed that all the examinees with the code number X series and Y series received question papers of L series and M series respectively. No row contains two papers with the same suffix number. L1, M3 and N4 are distributed in the second row. M4 is given to an examinee in the second column but the difference between M4 and L3 is of one row. The students of M4 and L5 Paper code live on 5th floor. N₁ is given to the examinee in 3rd column 4th row but the examinee in the last row did not receive N3. No floor below 5th floor is of different colour also no odd numbered floor is of different colour. The students of Y₂ and Z₁ code live on different coloured floor. X2, Z3 do not live on the ground floor. The suffix number of any examinee's code is not the same as the row number in which he is sitting and it is not the same as the suffix number of any question paper distributed in that row. Any question paper's suffix number and the row number in which it is distributed is not the same. Suffix numbers of no two papers in a row are the same. Only Students of code X4, Z₂ live between X2, Z3 and Y3, Z4. The students of paper code L4, N₁ do not live on odd numbered floor. The students of code X₂, Z3 do not live immediately below or immediately above the floor of students X5, Y4. The students of code X₁, Ys do not live on bottommost floor.

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