1.

If a, b, c are mutually perpendicular unit vectors, then \[|\mathbf{a}+\mathbf{b}+\mathbf{c}|\,\,=\]         [Karnataka CET 2002, 05; J & K 2005]

A.             \[\sqrt{3}\]
B.             3
C.             1
D.             0
Answer» B.             3


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