Let $a_n=\frac{3}{2n-1}$ for $n=1,2,3,$dots.

$($a$)$ Write the first three terms of $b_n=a_{n1}.$

$($Express numbers in exact form. Use symbolic notation and fractions where needed

$b_1=$

$$

$b_2=$

$$

$b_3=$

$$

$($b$)$ Write the first three terms of $c_n=a_{n3}.$

$($Express numbers in exact form. Use symbolic notation and fractions where needed.$)$