WBJEE 2017 Math Solved Paper

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Question : 55 of 75

Marks: +1, -0

Let for all x > 0, f(x) =

lim

n→∞

‌n‌(x

1

n

−1), then

f(x) + f(
1
x
) = 1
f(xy) = f(x) + f(y)
f(xy) = x f(y) + y f(x)
f(xy) = x f(x) + y f(y)

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