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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
Question

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?

A.

Two

B.

Three

C.

One

D.

Zero

Correct option is A

GIVEN: Seven persons M, N, O, P, Q, R and S
Solution:
1) Only four persons sit between O and R.
CASE 1

 CASE 2

2) Only two persons sit between N and M and M sits immediately above Q.
CASE – 1 is not possible in this condition So,
CASE 2:

3) O sits below M. N sits above M.
CASE 2

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

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