Parallelogram $ABCD$ has $A(0, 1)$, $B(2, 1)$ and $C(4, 0)$ as three of its vertices. What is the sum of the coordinates of point $D$?
Question:
Parallelogram $ABCD$ has $A(0, 1)$, $B(2, 1)$ and $C(4, 0)$ as three of its vertices. What is the sum of the coordinates of point $D$?
Answer:
Let's think step by step.

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Parallelogram $ABCD$ has $A(0, 1)$, $B(2, 1)$ and $C(4, 0)$ as three of its vertices. What is the sum of the coordinates of point $D$?
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