Question

Which of the following sets is not finite?
a. {x|x is a natural number less than 10}
b. {x|x is a whole number between 0 and 10}
c. {x|x is an integer that is less than 0}

Answer 1

It's C, because there are infinitely many integers less than 0: $-1,-2,-3,-4,-5,\ldots$ etc.

Answer 2

I got this question wrong, so when I went over my answers later I found out the correct answer is

A. {x|x is a natural number less than 10}