Let veca, vecb, vecc be three non-zero v...

Let `veca, vecb, vecc` be three non-zero vectors, which are pair-wise non-collinear. If `veca+ 3 vecb` is collinear with c and `vecb + 2 vecc` is collinear with `veca,` then `veca + 3 vecb + 6 vecc` is :

`veca` is parallel to `vecb`

`vecb`

`vec0`

`veca+ vecc.`

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