The difference between 9 and 15 is 6.
The difference between 15 and 21 is 6 as well.
Therefor, we know that each term has 6 added to it.
We can find the 32nd term by using the following function:
F(x) = 3 + 6x
By plugging in 32 to x, we can find the 32nd term.
F(32) = 3 + 6 * 32
F(32) = 195