MCQ
જો $\vec a \,\, = \,\,\frac{1}{{\sqrt {10} }}\,\,\left( {3\hat i\,\, + \;\,\hat k} \right)\,$ અને $\vec b \,\, = \,\,\frac{1}{7}\,\,\left( {2\hat i\,\, + \;\,3\hat j\,\, - \,\,6\hat k} \right)\,,$ તો $\left( {2\,\vec a - \,\,\vec b } \right)\,.\,\,\left[ {\left( {\vec a \times \,\,\vec b } \right)\,\, \times \,\left( {\vec a \times \,\,2\,\vec b } \right)\,} \right]$ નું મુલ્ય...........
- A$5$
- B$3$
- ✓$-5$
- D$-3$