If a + b + c = 8, a 2 + b 2 + c 2 = 30, and a 3 + b 3 + c 3 = 134, then the value of (abc) -1 is ?

AAI ATC Junior Executive 2016 Shift 2 Paper

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If a + b + c = 8, a² + b²+ c²= 30, and a³ + b³+ c³= 134, then the value of (abc)^-1 is ?

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