If ABC = 1, then the value of AAB + A + 1 + BBC + B + 1 + CCA + C + 1 is () A. 1B. 0C. -1D. -2
Then AAB + A + 1 + BBC + B + 1 + CCA + C + 1 = AC1 + AC + C + BBC + B + 1 + BC1 + BC + B = ABCB + 1 + BC + BB + B + 1 + BC1 + BC + B = 1 + B + BCB + 1 + BC = 1
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