UPSC NDA I and II 2020 Math Solved Paper

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Question : 53 of 120

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If x=logc(ab),y=loga(bc),z=logb(ca), then which of the following is correct?

[NDA-I 2020]

xyz=1
x+y+z=1
(1+x)−1+(1+y)−1+(1+z)−1=1
(1+x)−2+(1+y)−2+(1+z)−2=1

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