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veca, vecb, vec c are three vectors such...

`veca, vecb, vec c` are three vectors such that `veca + vecb + vec c = vec0, |veca| =1, |vecb| =2, |vec c|=3,` then :
`veca.vecb + vecb .vecc+ vecc.veca` is equal to :

A

`-7`

B

7

C

1

D

`0.`

Text Solution

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The correct Answer is:
A
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