Question

What the answer to this plz need help ASAP

Answer 1

Answer:

A) 9841

Step-by-step explanation:

Formula of geometric sequence:

$S_n=\frac{a_1*(r^n-1)}{r-1}$

First,  calculate the common ratio (r) of the sequence.

It can be calculated by dividing any term of the geometric sequence by the term preceding it.

$r = \frac{27}{9}\\ \\r=3$

Then

$Sum = \frac{1(3^9-1)}{3-1} \\\\Sum = \frac{3^9-1}{2}\\ \\Sum=\frac{19683-1}{2} \\\\Sum = \frac{19682}{2} \\\\Sum=9841$