Answer
The sequence is geometric.
Work Step by Step
The given sequence is
$\frac{3}{49},\frac{3}{7},3,21,...$
Calculate ratio between each pair of consecutive terms.
$\frac{3/7}{3/49}=7$
$\frac{3}{3/7}=7$
$\frac{21}{3}=7$
The common ratio is $7$.
So, the sequence is geometric.
