Function \( f(x)=\log _{a} x \) is increasing on \( R \), if (a) \( 0a1 \) (b) \( a1 \) (c) \( a...

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Function \( f(x)=\log _{a} x \) is increasing on \( R \), if
(a) \( 0a1 \)
(b) \( a1 \)
(c) \( a1 \)
(d) \( a0 \)
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