Answer
$2n$, $n$
Work Step by Step
Examine the graphs of roses with different $n$ values, we can see that for $n\ne0$ is even, the rose has $2n$ petals, while for $n\ne\pm1$ is odd, the rose has $n$ petals.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.