First slide

Functions (XII)

Question

If A = (3, 81) and $f : A \to B$ is a surjection defined by $f (x) = \log_{3} x$ then B =

Moderate

A

[1,4]
B

(1,4]
C

(1,4)
D

$[1, \infty)$

Solution

$3 < x < 81 \Rightarrow \log_{3} 3 < \log_{3} x < \log_{3} 8$ 1

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