Math: True or False.....................?

zombie

1- {2,5,8,9} = {2,5,9,8}

2- {3,7,12,14} = {3,7,12,14,0}

3- {3,7,12,14,0} = {3,7,12,14}

I know 1 is true, but what about 2 and 3?

Thanks