Combination If Function

Hi,

I am wanting to do a drop down list where you can select multiple options. For a list Attachment 1, Attachment 2, Attachment 3, Attachment 4, Attachment 5. If the combination is the same as in the list then you will get a "Pass" and if not then a "Fail"

I am struggling to see how you would do it if only not all of the items from the drop down box is selected.

Apologies if this this isn`t what these forums are intended for. My knowledge is very little compared to some people on here!

Thanks in advance!