Answer:
29,524
Explanation:
This is a geometric sequence; notice how each new term is 3 times the previous term. Thus, a(n) = 1 · 3^(n-1). The 10th term is a(10) = 3^(9) = 19683.
a(4) = 27 (given)
a(5) = 81 (calculated)
a(6) = 243
a(7) = 729
a(8) = 2107
a(9) = 6561
a(10) = 19683 (previously calculated)
So the sum of the first 10 terms is 29,524.
1 + 3 + 9 + 27 + 81 + ... + 6561 + 19683 =