The arithmetic mean of the series \( 1,2,2^{2}, \ldots ., 2^{n-1} \) is....

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The arithmetic mean of the series \( 1,2,2^{2}, \ldots ., 2^{n-1} \) is
\( \mathrm{P} \)
(1) \( \frac{2^{n}}{n} \)
(2) \( \frac{\left(2^{n}-1\right)}{n} \)
W
(3) \( \frac{2^{n+1}}{n} \)
(4) None of these



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