Hlo.. Step by step explanation....
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Step-by-step explanation:
Given system of equations has non-trivial solution.
⇒(1−a)[(1−b)(1−c)−1]+c+b=0
⇒1−(a+b+c)+ab+bc+ca−abc−1+(a+b+c)=0
∴ab+bc+ca=abc
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