7, 72 , 73 , _________ 7n సంఖ్యల గుణోత్తర మాధ్యమును కనుగొనండి .

1
\(7^\frac{n +1}{2}\)
2
\(7^\frac{n-1}{2}\)
3
\(7^\frac{n}{2}\)
4
\(7^\frac{n}{7}\)

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