If ā,b,c are three vectors such that ...

If ā,b,c are three vectors such that ` |veca |= 5, |vecb| = 12 and | vecc|=13` and `veca+vecb+vecc=0` then `veca.vecb+vecb.vecc+vecc.veca`

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The correct Answer is:

`=-169`

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