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.