Cho \(\overrightarrow a \left( {3; - 1;2} \right);...

Câu hỏi: Cho \(\overrightarrow a \left( {3; - 1;2} \right);\,\,\overrightarrow b \left( {5;2;4} \right)\). Tính \(\overrightarrow a  + \overrightarrow b \).

A \(\left( {3;1;6} \right)\)

B \(\left( {8;1;6} \right)\)

C \(\left( {7;6;1} \right)\)

D \(\left( {8;2;5} \right)\)