Given a + B + C = 4, a & # 178; + B & # 178; + C & # 178; = 6, find AB + BC + AC =?

A + B + C = 4, square root can get a & # 178; + B & # 178; + C & # 178; + 2Ab + 2Ac + 2BC = 16
According to a & # 178; + B & # 178; + C & # 178; = 6, we can get AB + BC + AC = 5

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