Question

From Sequences Come Series Quick Check
1 of 5
Write the sigma notation for the geometric series from the following finite geometric sequence: 3, 9, 27, 81, 243.(1 point)

∑3n=15(3)n−1


∑5n=15(3)n−1


∑5n=13(3)n−1


∑3n=13(3)n−1

Answer 1

Write it as a geometric series with a = 3 and r = 3:
∑_{n=1}^5 3(3)^{n-1}, which is equivalently ∑_{n=1}^5 3^n.