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Step-by-step explanation:
a + b + c = 6
a² + b² + c² = 14
(a+b+c)² = a² + b² + c² + 2(ab + bc + ca)
6² = 14 + 2(ab + bc + ca)
2(ab + bc + ca) = 22
ab + bc + ca = 11
a³ + b³ + c³ = 36
(a+b+c)(a² + b² + c² - ab - bc - ca) = a³ + b³ + c³ - 3abc
6(14 - 1(ab + bc + ca) = 36 - 3abc
84 - 6×11 = 36 - 3abc
3abc = 18
abc = 6
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ABC=3
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