WBJEE · Maths · Vector Algebra
If the volume of the parallelopiped with \(\vec{a} \times \vec{b}, \vec{b} \times \vec{c}\) and \(\vec{c} \times \vec{a}\) as coterminous edges is 9 cu. units., then the volume of the parallelopiped with \((\vec{a} \times \vec{b}) \times(\vec{b} \times \vec{c}),(\vec{b} \times \vec{c}) \times(\vec{c} \times \vec{a})\) and \((\vec{c} \times \vec{a}) \times(\vec{a} \times \vec{b})\) as coterminous edges is
- A 9 cu. units
- B 729 cu. units
- C 81 cu. units
- D 243 cu. units
Answer & Solution
Correct Answer
(C) 81 cu. units
Step-by-step Solution
Detailed explanation
Hint : Volume of Parallelopiped whose coterminous edges are \(\vec{a}, \vec{b}\) and \(\vec{c}=[\vec{a} \vec{b} \vec{c}]\) So, Given that \(\therefore[\overrightarrow{\mathrm{a}} \overrightarrow{\mathrm{b}} \overrightarrow{\mathrm{c}}]=3 \quad \ldots \ldots (II)\) Now volume of…
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