Question

Which of the following sets is an infinite set?

{1, 2, 3 . . . 100}

1. empty set
2. the set of whole numbers less than one billion
3. the set of natural numbers
4. none of the above

Answer 1

inifnite sets have no end


1. empty set doesn't go on forever. it doesn't even start, so no
2. nope, only about 999,999,999 numbers in that set
3. yes, this is all numbers from 1,2,3, to inifnity, so this is an infinite set


answer is 3rd option