Answer each of the following questions in one word or one sentence or as per exact requirement o...
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0Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
If the lines \( x+a y+a=0, b x+y+b=0 \) and \( c x+c y+1=0 \) are concurrent, then write the value of \( 2 a b c-a b-b c-c a \).
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