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2 years ago

What the answer to this plz need help ASAP

Mathematics

1 answer:

Step2247 [10]2 years ago

3 0

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

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

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