Question

Which set is closed under the operation multiplication?

A.
{0, 1}

B.
{1, 2}

C.
{0, 1, 2}

D.
{1, 2, 3}

Answer 1

A because 0 x 1 = 0

Answer 2

Closed under multiplication means that any member of the set times any other member of the set (including itself) yields another member of the set.