Let Q be the point (a, b). Since the midpoint of P (2, 3) and Q (a, b) is (4, 6), we have
(2 + a)/2 = 4
(3 + b)/2 = 6
Solve for a and b :
2 + a = 8
a = 6
3 + b = 12
b = 9
So the coordinates of Q are (6, 9).
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