Seven persons M, N, O, P, Q, R and S are sitting one above the other on a ladder (not necessarily in the same order). Only four persons sit between O and R. Only two persons sit between N and M and M sits immediately above Q. O sits below M. N sits above M.

How many persons are sitting between P and S?

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NTPC CBT-I (Held On: 13 Jan 2021 Shift 1)
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  1. Zero
  2. One
  3. Two
  4. Three

Answer (Detailed Solution Below)

Option 3 : Two
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RRB NTPC Graduate Level Full Test - 01
100 Qs. 100 Marks 90 Mins

Detailed Solution

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Given:

Seven persons M, N, O, P, Q, R and S

1) Only four persons sit between O and R.

Case - I

O/R

 

 

 

 

O/R

 

 

Case – II

 

O/R

 

 

 

 

O/R

 

2) Only two persons sit between N and M and M sits immediately above Q.

CASE – I is not possible in this condition So,

Case 2:

N

O/R

 

M

Q

 

O/R

 

3) O sits below M. N sits above M.

Case 2:

N

R

P/S

M

Q

P/S

O

 

Hence, ‘Two’ persons are sitting between P and S.

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