Answer:
\[\vec{A}=(\text{3}\text{1})\text{\hat{i}
}+\left( \text{2}-\text{ 2} \right)\text{\hat{j} }+\left[ \text{2}-\left(
-\text{1} \right) \right]\text{\hat{k}}=\text{2\hat{i}}+0\text{\hat{j}}+\text{3\hat{k}}=\text{2\hat{i}}+\text{3\hat{k}}\]and\[\text{A
}=\sqrt{{{2}^{2}}+{{3}^{2}}}=\sqrt{13}\].
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