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If veca=veci+2veck,vecb=veci+vecj+veck,v...

If `veca=veci+2veck,vecb=veci+vecj+veck,vecc=7veci-3vecj+4veck,vecr xxvecb+vecbxxvecc=vec0` and `vecr.veca=0`. Then `vecr.vecc` is equal to

A

30

B

36

C

32

D

34

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The correct Answer is:
D
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