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If vec(a) = overset(^^)(i) + 2overset(^^...

If `vec(a) = overset(^^)(i) + 2overset(^^)(j) - 3overset(^^)k` on `vec(b) = 2overset(^^)(i) - 2overset(^^)(j) - overset(^^)(k)` then `vec(a).vec(b)` is equal to .

A

1

B

0

C

`-1`

D

3

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