A=(1 a 2 -1),B=(3 b -1 1), dan C=(1 4 7 c). Jika AB=C, maka

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A=(1 a 2 -1),B=(3 b -1 1), dan C=(1 4 7 c). Jika AB=C, maka a+b+c= .....
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A=(1 a 2 -1),B=(3 b -1 1), dan C=(1 4 7 c). Jika AB=C, maka a+b+c= .....