Question

Which set is closed under the operation multiplication?


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


B.
{1, 2, 4}


C.
{0.5, 1, 2}


D.
{0}

Answer 1

what set can you take any two elements out of and when multiplied will still give you an element in the set?

Answer 2

for example
For set A, 2*3=6 is 6 in A?