What is your issue with this question? Are you asking because you don't understand the meaning of the term "Natural Numbers"? Do you not know how to tell whether a number is less than seven or not? Do you not know what it means to list a set in roster form?
The rules for posting say that you should make it clear what it is that you don't understand about the problem and you should show any work that you have done to solve it.
If your answer is that you don't understand any of it, then my answer is that you haven't been paying any attention to lectures or doing any of the required reading, so you need to go back and study the lesson that preceded this homework question.
If you still have questions after reviewing the classroom material and readings, then repost your question following the rules for posting. You need to carefully review the definition of Natural Numbers given to you by your instructor/teacher/professor because there are two commonly used definitions. Hence, your question, as posed, has two possible answers.
John
My calculator said it, I believe it, that settles it
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