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If `f(x)` is a function `f:R-> R`, we say `f(x)` has property I. If `f(f(x)) =x` for all real numbers x. II. `f(-f(x))=-x` for all real numbers x. How many linear functions, have both property I and Il ?

A

0

B

2

C

3

D

Infinite

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The correct Answer is:
B
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