Question

Which of the following sets is closed under subtraction?

A. Integers
B. Whole Numbers
C. natural numbers
D. irrational numbers

Answer 1

A. Integers

Explanation:

Subtraction of whole or natural numbers can result in a negative number that is not in the set. Subtraction of irrational numbers can result in a rational number (√2 -√2 = 0, for example).