Answer:
1, 3, 9, 27
Step-by-step explanation:
[tex] a_n = 3^{n - 1} [/tex]
You need the first 4 terms, so let n = 1, and evaluate the expression. Then do the same for n = 2, n = 3, and finally n = 4.
n = 1
[tex] a_1 = 3^{1 - 1} = 3^0 = 1 [/tex]
n = 2
[tex] a_2 = 3^{2 - 1} = 3^1 = 3 [/tex]
n = 3
[tex] a_3 = 3^{3 - 1} = 3^2 = 9 [/tex]
n = 4
[tex] a_4 = 3^{4 - 1} = 3^3 = 27 [/tex]
