Question

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Which set is closed under the operation multiplication?






A.

{1, 2, 3}






B.

{0, 1, 2}






C.

{0, 1}






D.

{1, 2}

Answer 1

C.. You can get an explanation here: http://openstudy.com/study#/updates/5282ec1be4b06a94e493c1e8
And here: http://www.cut-the-knot.org/do_you_know/mul_set.shtml
:D

Answer 2

http://www.freemathhelp.com/order-of-operations.html try this site