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If ` vec a , vec ba n d vec c` are three non-zero vectors, no two of which ar collinear, ` vec a+2 vec b` is collinear with ` vec b+3 vec c` is collinear with ` vec a ,` then find the value of `| vec a+2 vec b+6 vec c|dot`

A

Zero

B

1

C

9

D

none of these

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A
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