Question

Find the formula for the nth term for the following sequence.
3, 9, 27, 81, …
A(n)=3^n-1
A(n)=3(3^n)
A(n)=3(3^n-1)

Answer 1

hint:
we have to apply this formula:
\[{a_n} = {a_1} \times {r^{n - 1}}\]

Answer 2

what's the "common ratio" or "r" of it?

Answer 3

where a_n and a_1 are the tenth and first term respectively, whereas r is the common ratio of our sequence.

Answer 4

I think r =3 @jdoe0001

Answer 5

OK thanks

Answer 6

thanks!