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Question

Which of the following expressions are meaningful?

A
u.(v×w)
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B
(u.v).w
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C
(u.v)w
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D
u×(v.w)
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Solution

The correct options are
A u.(v×w)
C (u.v)w
Clearly option B and C are meaningful.
B. Dot product of a scaler and a vector is not defined or meaningless.
D. Cross product of a scaler and a vector is not defined or meaningless.

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