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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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