2. Sets

Determine whether each set is well defined.

The set of all even integers

Determine whether each set is well defined.

The set of all large cities in the world

Fill in the blank with ∈ or ∉ to make the statement true.

15 ____ {3,6,9,12,…}

Fill in the blank with ∈ or ∉ to make the statement true.

D ____ {A,C,E,G,…}