If \( f: R \rightarrow R \) is defined by \( f(x)=x^{2}+1 \), then the number of elements in \( ....

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If \( f: R \rightarrow R \) is defined by \( f(x)=x^{2}+1 \), then the
\( \mathrm{P} \)
number of elements in \( f^{-1}(17) \cup f^{-1}(-3) \) is
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