Question

Which set of numbers is not closed under multiplication ?

a.) real numbers
b.) rational numbers
c.) integers
d.) irrational numbers

Answer 1

d.)irrational numbers

Answer 2

D). irrational numbers

Explanation:

The irrational numbers are the set of number which can NOT be written as a ratio (fraction). Decimals which never end nor repeat are irrational numbers. Irrational numbers are "not closed" under addition, subtraction, multiplication or division.