Question

which set of numbers is not closed under multiplication

Answer 1

For a set of numbers to be closed under multiplication, the product of any two numbers in the set must also be in the set. The prime numbers are, therefore, not closed under multiplication. prime x prime = composite

Answer 2

thx

Answer 3

but wait it has either real number, rational,integer or irrational

Answer 4

Sorry. If you are limited to these choices, consider the following:\[\sqrt{2}\times \sqrt{2}=2\]Does that help?

Answer 5

Yes Thank yu