Given a G.P. with \( a=729 \) and \( 7^{\text {th }} \) term 64 , d...

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Given a G.P. with \( a=729 \) and \( 7^{\text {th }} \) term 64 , determine \( \mathrm{S}_{7} \).
\( \mathrm{P} \)
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