The sides AB and DC of cyclic quadrilateral ABCD are produced to meet at P,
The sides AB and DC of cyclic quadrilateral ABCD are produced to meet at P, the sides AD and BC are produced to meet at Q. If ∠ADC = 850 and ∠BPC = 400, then ∠CQD equals.
(A) 300
(B) 450
(C) 600
(D) 750
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