If AM of the number \( 5^{1+x} \) and \( 5^{1-x} \) is 13 then the ... VIDEO
If AM of the number \( 5^{1+x} \) and \( 5^{1-x} \) is 13 then the set of possible real values of \( x \) is
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(a) \( \left\{5, \frac{1}{5}\right\} \)
(b) \( \{1,1\} \)
(c) \( \left\{x \mid x^{2}-1=0, x \in R\right\} \) (d) none of these
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