Teaching EMRS PGT Mock Test 2023 Mathematics Sequences and Series Geometric Progressions

Find the sum of the series  3 + 9 + 27 + 81 + ..... + 6561?

1
38 - 1
2
\(\frac{{{\rm{3\;}}\left( {{{\rm{3}}^{\rm{8}}} - 1} \right)}}{{2}}\)
3
\(\frac{{{\rm}\left( {{{\rm{3}}^{\rm{8}}} - 1} \right)}}{{2}}\)
4
None of the above
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