Question

Which set is closed under the operation multiplication?








A.
{1, 2, 4}







B.
{0}







C.
{0.5, 1, 2}







D.
{1, 2, 3, 4, 5}

Answer 1

please help im on a quiz !! :/

Answer 2

If you multiply two numbers from a closed set the answer is in the set.
So A is not closed because 2 x 2 = 4 which isn't in the set. Only 0.5, 1, and 2 are in set A.

Answer 3

oh ok thanks @Nurali