Question

Ed has 93 marbles. In which sequence can he arrange them and use all the marbles?

A.) a sequence with six terms that starts with 1 and has a common ratio of 2
B.) a sequence with six terms that starts with 1 and has a common ratio of 3
C.) a sequence with six terms that starts with 3 and has a common ratio of 2
D.) a sequence with five terms that starts with 3 and has a common ratio of 2
E.) a sequence with five terms that starts with 1 and has a common ratio of 3

Answer 1

\[S_n=\frac{r^n - 1}{r - 1}\]
Find \[S_n\] for each one of them

Answer 2

\[S_n = a \frac{r^n - 1}{r - 1}\]