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Let `vec a, vec b` and `vec c` be three non zero vectors such that no two of these are collinear. If the vector `vec a + 2 vec b` is collinear with `vec c` and `vec b` + `3 vec c` is collinear with `vec a then `vec a` + `2 vec b` + `6 vec c` =

A

`lambda vec a`

B

`lambda vec b`

C

`lambda vec c`

D

`vec 0`

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The correct Answer is:
D
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