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If vec a and vec b are mutually perpendi...

If `vec a` and `vec b` are mutually perpendicular unit vectors, then (3 vec a + 2 vec b). (5 vec a - 6 vec b)= `

A

coplanar such that `vec AB perpendicular vec CD`

B

non coplanar points

C

collinear points

D

non collinear points

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The correct Answer is:
C
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