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Three vectors overline(a),overline(b) an...

Three vectors `overline(a),overline(b) and overline(c)` satisfy the condition `vec(a)+vec(b)+vec(c)=vec(0)`
evaluate `mu=vec(a).vec(b)+vec(b).vec(c)+vec(c).vec(a) if |vec(a)|=1,|vec(b)|=4 and |vec(c)|=2`

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