If \( \mathrm{P}, Q \) and \( R \) are three points with coordinates \( (1,4) \), \( (4,5) \) an....

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If \( \mathrm{P}, Q \) and \( R \) are three points with coordinates \( (1,4) \), \( (4,5) \) and \( (m, m) \) respectively, then the value of \( m \) for
P
which \( P R+R Q \) is minimum, is:
W
(1) 4
(2) 3
(3) \( \frac{17}{8} \)
(4) \( \frac{7}{2} \)


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