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Un = a.n^(n - 1)
2187 = 3 . 3^(n - 1)
729 = 3^(n - 1)
3^6 = 36^(n - 1)
6 = n - 1
n = 7
Sn = a.{(r^n) - 1} / (r - 1)
S7 = 3 {(3^7) - 1} / (3 - 1)
S7 = 3{ 2187 - 1) / 2
= 3(2186) / 2
= 3.(1093)
=3279