Find an explicit rule for the nth term of the sequence. -3, -15, -75, -375, ...

2 answers:

Helga [31]2 years ago

6 0

The answer is B, I have just confirmed it.

koban [17]2 years ago

4 0

It's a geometric progression where
$a=-3\\
r=5$

$a_n=ar^{n-1}\\
a_n=-3\cdot5^{n-1}$

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