Answer
$<0,0>$
Work Step by Step
Here, we have $A=\lt 1,-1 \gt, B=\lt 2,0 \gt, C=\lt -1, 3 \gt, D=\lt -2,2 \gt$
$\overrightarrow{AB}+\overrightarrow{CD}=\lt 1,-1 \gt \lt 2,0 \gt+\lt -1, 3 \gt \lt -2,2 \gt$
or, $\overrightarrow{AB}+\overrightarrow{CD}=\lt 1,1 \gt +\lt -1,-1 \gt=\lt 1-1, 1-1 \gt =<0,0>$
