\(4.5\times 2^{n}\)
\(4.5\times 2^{2n}\)
\(9\times 2^{n-1}\)
\(9\times 2^{2n}\)
Correct answer is C
\(K = 81 \times 2^{2n - 2}\)
\(\sqrt{K} = \sqrt{81 \times 2^{2n - 2}}\)
= \(9 \times 2^{n - 1}\)
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