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If (veca+vecb) is perpendicular to veca ...

If `(veca+vecb)` is perpendicular to `veca` and magnitude of `vecb` is twice that of `veca` then what is the value of `(4veca+vecb).vecb` equal to?

A

0

B

1

C

`8|veca|^(2)`

D

`8|vecb^(2)|`

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