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If vec a and vec b are not perpendicular...

If `vec a` and `vec b` are not perpendicular to each other and `vec r xx vec a = vec b xx vec a, vec r. vec c = vec 0` then `vec r =`

A

`vec a - vec c`

B

`vec b +x vec a, for all scalars x`

C

`vec b - ((vec b.vec c)/(vec a .vec c)) vec a`

D

none of these

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The correct Answer is:
C
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