$\lt 1,-4 \gt$
Work Step by Step
Let us consider $A$ and $B$ as vectors. and, a vector $a$ can be found as: $a=B-A=\lt 2,-1 \gt -\lt 1,3 \gt =\lt 1,-4 \gt$ Hence, our final answer is: $\lt 1,-4 \gt$
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