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Home/Practice questions/Maths. Section B1
Maths. Section B1Vectors

If vec a,vec b,vec c are any three vectors such that (vec a+vec b).ve…

If $\vec a,\vec b,\vec c$ are any three vectors such that $(\vec a+\vec b).\vec c=(\vec a-\vec b).\vec c = 0$, then $(\vec a×\vec b)×\vec c$ is

Answer & explanation+

Correct answer: option 1

We have,

$(\vec a+\vec b).\vec c=(\vec a-\vec b).\vec c = 0⇒\vec b.\vec c=0=\vec a.\vec c$

$∴(\vec a×\vec b)×\vec c=(\vec c.\vec a)\vec b-(\vec c.\vec b)\vec a=\vec 0$

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