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The function f:R rarrR is defined by f(x...

The function `f:R rarrR` is defined by `f(x)=3^(-x)`. Observe the following statements
I. f is one - one
II. f is onto
III. F is a decreasing function
Out of these, true statements are :

A

only I, II

B

only II, III

C

only I, III

D

I, II, II

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