If the vertices P, Q, R of aQ R are rational points, which of the following points of the P Q R i...

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If the vertices P, Q, R of aQ R are rational points, which of the following points of the P Q R is/are always rational point(s)
(1998,2 M)
(a) centroid
(b) incentre
(c) circumcentre
(d) orthocentre

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