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$\bigg[ \overrightarrow {a}+ 2 \overrightarrow {b}- \overrightarrow {c}\bigg].\bigg[\overrightarrow {a}- \overrightarrow {b}\bigg] \times \bigg[\overrightarrow {a}-\overrightarrow {b}-\overrightarrow {c}\bigg]=$

\[\begin {array} {1 1} (1)\;-\bigg[ \overrightarrow {a}\; \overrightarrow {b}\; \overrightarrow {c}\bigg] & \quad (2)\;2\bigg[ \overrightarrow {a}\; \overrightarrow {b}\; \overrightarrow {c}\bigg] \\ (3)\;3\bigg[ \overrightarrow {a}\; \overrightarrow {b}\; \overrightarrow {c}\bigg] & \quad (4)\; \overrightarrow {0} \end {array}\]

1 Answer

$ (3)\;3\bigg[ \overrightarrow {a}\; \overrightarrow {b}\; \overrightarrow {c}\bigg] $
answered Nov 7, 2013 by pady_1
 

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