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UPSC NDA II 2014 Mathematics Paper

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For the next three (03) items that follow:
Consider the function f(x)=

x−1

x+1

[NDA II 2014]

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Question : 24

Total: 120

What is f(2x) equal to ?

f(x)+1
f(x)+3
f(x)+1
3f(x)+1
3f(x)+1
f(x)+3
f(x)+3
3f(x)+1

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