UPSC CDS 1 2021 Math Paper

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Question : 30 of 100

Marks: +1, -0

What is

1

bc(a−b)(a−c)

+

1

ca(b−c)(b−a)

+

1

ab(c−a)(c−b)

equal to?

a+b+c
3
ab+bc+ca
0

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