For \( y=\log _{a} x \) to be defined ' \( a \) ' must be....

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For \( y=\log _{a} x \) to be defined ' \( a \) ' must be
\( \mathrm{P} \)
(1) Any positive real number
(2) Any number
(3) \( \geq e \)
(4) Any positive real number \( \neq 1 \)


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