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The vertices of a parallelogram `A B C D` are `A(3,1),B(13 ,6),C(13 ,21),` and `D(3,16)dot` If a line passing through the origin divides the parallelogram into two congruent parts, then the slope of the line is (a) `(11)/(12)` (b) `(11)/8` (c) `(25)/8` (d) `(13)/8`

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