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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

  1. A 9 cu. units
  2. B 729 cu. units
  3. C 81 cu. units
  4. D 243 cu. units
Verified Solution

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…