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UPSC NDA II 2023 Mathematics Solved Paper

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Consider the following for the next two (02) items that follow :
Let f(x)=‌

ax−1+bx−1

2

and g(x)=x−1

[NDA II 2023]

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Question : 54

Total: 120

What is

√ab
ab
2‌ab
‌
√ab
2

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