add ta following. a-b+ab,b-c+bc,c-a+ac
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sorry I dont know the answer
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(a-b+ab)+(b-c+bc)+(c-a+ac)
= a-b+bc+b-c+bc+c-a+ac
= a-a+b-b+c-c+ab+bc+ca
= ab+bc+ca
please mark me as brainliest
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