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    In a row of a few students, P was standing 17th^{th}th​ from the left end and 23rd^{rd}rd​ from the right end. If Q was standing exactly in the middle
    Question

    In a row of a few students, P was standing 17th^{th}​ from the left end and 23rd^{rd}​ from the right end. If Q was standing exactly in the middle of the row, what was his position from the extreme left end? Assume that the students were facing the north.

    A.

    22nd^{nd}​​

    B.

    18th^{th}​​

    C.

    19th^{th}​​

    D.

    20th^{th}​​

    Correct option is D

    ​​P is 17th from the left end and 23rd from the right end.
    Q is in the middle of the row.
    The total number of students = 17 + 23 − 1=39 (subtracting 1 because we counted P twice).​
    The middle position in a row of 39 students is the 20th position.
    Thus, correct option is (d).

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