UPSC CDS Math Basic operation and Factorisation Questions

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Question : 21 of 77
 
Marks: +1, -0
If ab+bc+ca=0, then the value of
(b2−ca)(c2−ab)+(a2−bc)(c2−ab)+(a2−bc)(b2−ca)
(a2−bc)(b2−ca)(c2−ab)
is
[2018 CDS-II]
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