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Q77. Consider the point A = (3, 4), B = (7, 13). If P be a point on the line y = x such that PA + PB is minimum, then coordinates of P is 
   
   (1)  13 7 , 13 7                                  (2)  23 7 , 23 7



  (3)  31 7 , 31 7                                     (4)  33 7 , 33 7

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