Hi everyone. I am a newbie here. I am taking an online math class, so I am pretty much on my own. It is Survey of Mathmatics. I hope someone can help me with this one problem.

Calculate the number of subsets for the set, then calculate the number of proper subsets,

{x l x e N and x lies between 8 and 12}

The e should be a sign for element but I can't make that.

I appreciate any help you can give me.

Mirage20