Answer
Infinite; 10 is NOT an element of the set.
Work Step by Step
The set is infinite because the elements continue to divide by 2, which has no end. 10 is not part of the set because the set starts at 1 and only decreases from there.
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.