If u-a- b- c -b- c- a -c- a- b then

The correct option is C u=0 a× (b× c) = (a.c)b (a.b)c Similarly b×(c× a) = (b.a)c (b.c)a and c×(a× b) = (c.b)a (c.a)b ∴ u=a× ( b× c ) ...

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if u=a× b× ...

Question

if $u = a \times (b \times c) + b \times (c \times a) + c \times (a \times b)$ then

u is a unit vector

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u = a + b + c

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u = 0

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u \neq 0

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