If \[\mathbf{a}=2\mathbf{i}+\mathbf{j}-8\mathbf{k}\] and \[\mathbf{b}=\mathbf{i}+3\mathbf{j}-4\mathbf{k},\] then the magnitude of \[\mathbf{a}+\mathbf{b}=\] [MP PET 1996]

If \[\mathbf{a}=2\mathbf{i}+\mathbf{j}-8\mathbf{k}\] and \[\mathbf{b}=

1.	If \[\mathbf{a}=2\mathbf{i}+\mathbf{j}-8\mathbf{k}\] and \[\mathbf{b}=\mathbf{i}+3\mathbf{j}-4\mathbf{k},\] then the magnitude of \[\mathbf{a}+\mathbf{b}=\] [MP PET 1996]
A.	13
B.	\[\frac{13}{3}\]
C.	\[\frac{3}{13}\]
D.	\[\frac{4}{13}\]
Answer» B. \[\frac{13}{3}\]

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If \[\mathbf{a}=2\mathbf{i}+\mathbf{j}-8\mathbf{k}\] and \[\mathbf{b}=\mathbf{i}+3\mathbf{j}-4\mathbf{k},\] then the magnitude of \[\mathbf{a}+\mathbf{b}=\] [MP PET 1996]

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