Question

Find the first term of a geometric sequence whose fourth term is -6 and whose common ratio is 1/3.

Answer 1

in a geometric progression
\[T_{n} = a \times r^{n-1} \]

Answer 2

\[T_{n} = -6\]
a = what u have to find
n = 4
r = 1/3

can u find it now ?