Comprehension

Direction: Study the following information to answer the given questions:

Seven boxes M, N, O, P, Q, R and S are kept one above another to form a stack. The topmost box is numbered as 1, the box below it as 2 and so on till the lowermost box as 7. Box P is three boxes above box O, which is an odd numbered box. Box M is just above box S. Box Q is prime numbered box but not adjacent to box P. Box N is above box R, which is not adjacent to box P.

Which box is the topmost box?

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RRB Clerk Prelims Memory Based Paper (Held On: 17 August 2024 Shift 2)
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  1. Box N
  2. Box M
  3. Box Q
  4. Box R
  5. Box S

Answer (Detailed Solution Below)

Option 1 : Box N
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Detailed Solution

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Boxes: M, N, O, P, Q, R and S.

1) Box P is three boxes above box O, which is an odd numbered box. So, box O can be either box 7 or box 5.

2) Box Q is prime numbered box but not adjacent to box P. So, box Q can be either box 2 in case 1 or box 7 in case 2.

Box Number

Case 1

Case 2

1

 

 

2

Q

P

3

 

 

4

P

 

5

 

O

6

 

 

7

O

Q

 

3) Box M is just above box S.

Box Number

Case 1

Case 2

1

 

 

2

Q

P

3

 

M

4

P

S

5

M

O

6

S

 

7

O

Q

 

4) Box N is above box R, which is not adjacent to box P. (So, case 1 would be invalid)

Box Number

Boxes

1

N

2

P

3

M

4

S

5

O

6

R

7

Q


Hence, box N is the topmost box. 

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