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Three vectors veca,vecbandvecc satisfy t...

Three vectors `veca,vecbandvecc` satisfy the condition `veca+vecb+vecc=vec0` . Evaluate the quantity `mu=veca*vecb+vecb*vecc+vecc*veca`, if `|veca|=3,|vecb|=4and|vecc|=2`.

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The correct Answer is:
`-(21)/2`
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