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1. |
If \(\vec a, \vec b\:and \: \vec c\) are coplanar, then what is \((2\vec a\times 3\vec b)\cdot4\vec c+(5\vec b\times 3\vec c)\cdot6\vec a\) equal to? |
A. | 114 |
B. | 66 |
C. | 0 |
D. | -66 |
Answer» D. -66 | |