$$\(\mathbf{8} \quad \mathbf{m}=\binom{11}{5} \quad \mathbf{n}=\binom{8}{-3}\)$$ （a）Find $$\(2 \mathbf{m}-\mathbf{n}\)$$ ． （b）The vector $$\(\binom{5}{\sqrt{y}}\)$$ has a magnitude of 7 ． Find the value of $$\(y\)$$ ． y = ............................................

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